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Note 5 - Cash and Due From Bank - (Details Textual) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Reserve Requirements with Federal Reserve	$ 0	$ 0

X

- Definition

Reserve Requirements With Federal Reserve

+ References

No definition available.

+ Details

Name:	bfst_ReserveRequirementsWithFederalReserve
Namespace Prefix:	bfst_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant