Basis of Presentation (Details)	Jun. 30, 2018
Jesse T. Correll, Chief Executive Officer and Chairman of the Board [Member]
Related Party Disclosure [Line Items]
Ownership interest percentage	64.98%
FSBI [Member] \| FSNB [Member]
Related Party Disclosure [Line Items]
Ownership in subsidiary bank	100.00%

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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