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Consolidated Statements of Stockholders' Equity (Unaudited) (Parentheticals) - shares | 3 Months Ended
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Sep. 30, 2025 | Jun. 30, 2025 | Mar. 31, 2025 | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024
ESOP shares released, shares (in shares) | 6,741 | 6,668 | 6,595 | 6,447 | 6,668 | 6,447

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- 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