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Borrowings (Details) - USD ($)		3 Months Ended	6 Months Ended
	Mar. 30, 2021	Jun. 30, 2021	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020
Debt Instrument [Line Items]
Long-term debt outstanding		$ 54,700,000	$ 54,700,000	$ 53,745,000	$ 68,448,000
FHLB Advances
Debt Instrument [Line Items]
Long-term debt outstanding		$ 31,000,000	$ 31,000,000	38,716,000
Weighted average rate percentage		2.43%	2.43%
Subordinated debt
Debt Instrument [Line Items]
Long-term debt outstanding		$ 15,000,000	$ 15,000,000	0
Interest rate percentage	4.00%
Subordinated debt issued	$ 15,000,000.0
Debt Instrument, issuance price, percentage	100.00%
Loan payable to local bank, 4.5% | Loan payable to local bank
Debt Instrument [Line Items]
Long-term debt outstanding		$ 0	$ 0	1,329,000
Interest rate percentage		4.50%	4.50%
Period of fixed interest rate			5 years
Loan payable variable rate, FCBI | Unsecured promissory note
Debt Instrument [Line Items]
Long-term debt outstanding		$ 2,700,000	$ 2,700,000	2,700,000
Interest rate percentage		3.25%	3.25%
Trust preferred subordinated debt, NWSB | Subordinated debt
Debt Instrument [Line Items]
Long-term debt outstanding		$ 0	$ 0	5,000,000
Interest rate percentage		6.39%	6.39%
Subordinated debt issued		$ 5,000,000	$ 5,000,000
Trust preferred subordinated debt, FCBI | Subordinated debt
Debt Instrument [Line Items]
Long-term debt outstanding		6,000,000	6,000,000	$ 6,000,000
Subordinated debt issued		$ 6,000,000	$ 6,000,000
Trust preferred subordinated debt, FCBI | Subordinated debt | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Interest rate percentage		1.74888%	1.74888%
Basis spread on prime rate, percentage		1.63%

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