Employees
| Concept | As at 2024-03-31 | As at 2024-03-31 | As at 2024-03-31 | As at 2024-03-31 | As at 2024-03-31 | 
|---|---|---|---|---|---|
| Employees | |||||
| Metrics related to human capital diversity | |||||
| Metrics of consolidated subsidiaries | |||||
| Consolidated subsidiaries | 
                                                十八親和銀行
                                                
                                             | 
                                                福岡銀行
                                                
                                             | 
                                                熊本銀行
                                                
                                             | 
                                                福銀事務サービス
                                                
                                             | 
                                                福岡中央銀行
                                                
                                             | 
| Ratio of female employees in managerial positions | 
                                                0.166
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.169
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.267
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.660
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.187
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Ratio of male employees taking childcare leave | |||||
| All employees | 
                                                1.02
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1.00
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1.08
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1.08
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Differences in wages between male and female employees | |||||
| All employees | 
                                                0.415
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.390
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.483
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.578
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.549
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Regular employees | 
                                                0.638
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.604
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.708
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.783
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.663
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Non-regular employees | 
                                                0.502
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.360
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.342
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.398
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.500
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             |