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BORROWINGS (Schedule of Maturities of Long-term Debt) (Details) - USD ($)		12 Months Ended
	Mar. 30, 2021	Dec. 31, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
FHLB fixed-rate advances maturing within one year of balance sheet date, Amount		$ 0	$ 11,000,000
FHLB fixed-rate advances maturing within one year of balance sheet date, Rate		0.00%	2.69%
Long-term debt		$ 21,000,000	$ 34,700,000
Long-term debt, Rate		3.78%	2.69%
Maximum borrowings from FHLB		$ 821,375,000
Available borrowings from FHLB		808,275,000
Trust preferred subordinated debt
Debt Instrument [Line Items]
Long-term debt		$ 15,000,000	$ 15,000,000
Effective rate, percentage		4.00%	4.00%
Interest rate percentage	4.00%
Subordinated debt issued	$ 15,000,000
Debt Instrument, Issuance Price, Percentage	100.00%
Loan payable variable rate, FCBI | Unsecured Debt
Debt Instrument [Line Items]
Long-term debt		$ 0	$ 2,700,000
Effective rate, percentage		0.00%	3.32%
Interest rate percentage		3.25%
Trust Preferred Subordinated Debt, FCBI | Trust preferred subordinated debt
Debt Instrument [Line Items]
Long-term debt		$ 6,000,000	$ 6,000,000
Effective rate, percentage		3.21%	1.69%
Subordinated debt issued		$ 6,000,000
London Interbank Offered Rate (LIBOR) | Trust Preferred Subordinated Debt, FCBI | Trust preferred subordinated debt
Debt Instrument [Line Items]
Interest rate percentage		6.399%
Basis spread on prime rate, percentage		1.63%
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Trust preferred subordinated debt
Debt Instrument [Line Items]
Basis spread on prime rate, percentage	3.29%

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