BORROWINGS (Schedule of Maturities of Long-term Debt) (Details) - USD ($)				3 Months Ended	12 Months Ended
		Mar. 31, 2026	Mar. 30, 2021	Mar. 31, 2026	Dec. 31, 2025	Mar. 12, 2026	Dec. 31, 2024
Debt Instrument [Line Items]
Long-term debt					$ 255,376,000		$ 255,333,000
Maximum borrowings from FHLB					1,290,000,000
Available borrowings from FHLB					1,010,000,000.00
FHLB fixed-rate advances maturing year two, amount					$ 90,000,000		$ 80,000,000
FHLB fixed-rate advances maturing year two, rate					4.55%		4.71%
FHLB fixed-rate advances maturing year three, amount					$ 35,000,000		$ 90,000,000
FHLB fixed-rate advances maturing year three, rate					4.23%		4.55%
FHLB fixed-rate advances maturing year four, amount					$ 30,000,000		$ 35,000,000
FHLB fixed-rate advances maturing year four, rate					4.25%		4.23%
FHLB fixed-rate advances maturing year five, amount							$ 30,000,000
FHLB fixed-rate advances maturing year five, rate							4.25%
Long-term debt, Rate					4.52%		4.52%
Federal Home Loan Bank Stock					$ 13,900,000
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged					$ 1,850,000,000
Federal Home Loan Bank, Advance, Maturity, Average Interest Rate, Year One					4.71%
Federal Home Loan Bank, Advance, Maturity, Year One					$ 80,000,000
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%
Basis spread on prime rate, percentage			3.29%
Subordinated debt issued			$ 15,000,000.0
Debt Instrument, Issuance Price, Percentage			100.00%
Trust preferred subordinated debt | Forecast
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage		100.00%
Trust preferred subordinated debt | Subsequent Event
Debt Instrument [Line Items]
Interest rate percentage						5.875%
Subordinated debt issued						$ 15,000,000.0
Trust Preferred Subordinated Debt, FCBI | Trust preferred subordinated debt
Debt Instrument [Line Items]
Long-term debt	[1]				$ 5,376,000		$ 5,333,000
Effective rate, percentage					6.15%		6.25%
Basis spread on prime rate, percentage					1.63%
Subordinated debt issued					$ 6,000,000.0
Trust Preferred Subordinated Debt, FCBI | Trust preferred subordinated debt | Subsequent Event
Debt Instrument [Line Items]
Basis spread on prime rate, percentage				5.61%

[1] Net of purchase accounting fair value mark.