Shareholdings
| Concept | As at 2023-12-31 | As at 2023-12-31 | As at 2022-12-31 | As at 2022-12-31 | 
|---|---|---|---|---|
| Shareholdings | ||||
| Reporting company | ||||
| Details of specified investment shares held for purposes other than pure investment | ||||
| Issue | 
                                                株式会社あいちフィナンシャルグループ(注)1
                                                
                                             | 
                                                株式会社名古屋銀行
                                                
                                             | — | — | 
| Number of shares | 
                                                15,651
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                14,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                14,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                15,651
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
| Carrying amount | 
                                                36,059,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                76,160,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                46,550,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                36,044,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Whether issuer of aforementioned shares holds reporting company's shares | 
                                                有
                                                
                                             | 
                                                有
                                                
                                             | — | — |