Summary of Significant Accounting Policies, Nature of Operations and Principles of Consolidation (Details)	Dec. 31, 2023 Office
Summary of Significant Accounting Policies [Abstract]
Number of retail-banking offices	3

The number of retail-banking offices operated by the entity.

No definition available.

Name:	byfc_NumberOfRetailBankingOffices
Namespace Prefix:	byfc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant