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Deposits (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Statistical Disclosure for Banks [Abstract]
Time deposits	$ 52.5	$ 55.6

Amount of time deposit liabilities, including certificates of deposit.

No definition available.

Name:	sbfg_TimeDeposit
Namespace Prefix:	sbfg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

No definition available.

Name:	srt_StatisticalDisclosureForBanksAbstract
Namespace Prefix:	srt_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration