Disclosure Of Financial Instruments [Text Block]
| Concept | As at 2021-12-31 | As at 2020-12-31 | 
|---|---|---|
| Disclosure of financial instruments [text block] | — | — | 
| Disclosure of credit risk [text block] | — | — | 
| Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [text block] | — | — | 
| Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [abstract] | ||
| Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] | ||
| Exposure to credit risk on loan commitments and financial guarantee contracts | 
                                                713,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                1,003,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
| Disclosure of credit risk exposure [text block] | — | — | 
| Disclosure of credit risk exposure [abstract] | ||
| Disclosure of credit risk exposure [line items] |