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Borrowings - Narrative (Details) - USD ($) $ in Thousands		3 Months Ended
	Mar. 30, 2021	Sep. 30, 2024	Mar. 15, 2024
Debt Instrument [Line Items]
Bank par value		$ 10,600
Bank lines of credit		$ 192,000
Weighted average rate percentage		4.52%
Amount eligible to borrow from FHLB		$ 920,100
Amount available to borrow from FHLB		684,000
Subordinated debt
Debt Instrument [Line Items]
Subordinated debt issued	$ 15,000
Basis spread on prime rate, percentage	3.29%
Interest rate percentage	4.00%
Debt Instrument, issuance price, percentage	100.00%
Trust preferred subordinated debt, FCBI | Subordinated debt
Debt Instrument [Line Items]
Subordinated debt issued		$ 6,000
Basis spread on prime rate, percentage		1.63%
Interest rate percentage			6.84%

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