Basis of Presentation (Details)	Mar. 31, 2021
Chief Executive Officer and Chairman of the Board [Member]
Ownership Interest [Abstract]
Ownership interest percentage	64.94%
FSBI [Member] \| FSNB [Member]
Ownership Interest [Abstract]
Ownership in subsidiary bank	100.00%

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

No definition available.

Name:	us-gaap_MinorityInterestOwnershipPercentageByParent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant