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Consolidated Statements of Stockholders' Equity (Unaudited) (Parentheticals) - shares	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
ESOP shares released, shares (in shares)	6,595	6,447

X

- Definition

Represents the number of unearned ESOP shares released during the period.

+ References

No definition available.

+ Details

Name:	bsbk_ReleaseOfEsopUnearnedSharesShares
Namespace Prefix:	bsbk_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration