Subordinated Debentures - Additional Information (Detail) - USD ($) $ in Thousands		12 Months Ended
	Nov. 30, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 17, 2007	Mar. 23, 2007	Jun. 15, 2005	Sep. 20, 2004	Mar. 26, 2003
Subordinated Borrowing [Line Items]
Subordinated debentures		$ 103,799	$ 103,735
Investment in common stock of trust						$ 148
Futura Ban Corp [Member]
Subordinated Borrowing [Line Items]
Subordinated debentures				$ 4,700
Subordinated Note Purchase Agreement [Member]
Subordinated Borrowing [Line Items]
Aggregate Principal Amount	$ 75,000
Subordinated debenture, maturity date	Dec. 31, 2031
Subordinated debenture, maturity year	2031
Debt instrument, variable interest rate percentage	3.25%
Subordinated Debentures [Member] | Futura Ban Corp [Member]
Subordinated Borrowing [Line Items]
Acquisition fair value				$ 4,600
Senior Subordinated Notes [Member]
Subordinated Borrowing [Line Items]
Redemption Price Percentage		100.00%
First Citizens Statutory Trust III [Member]
Subordinated Borrowing [Line Items]
Subordinated debentures		$ 12,887	$ 12,887				$ 12,900
Investment in common stock of trust							$ 387
Debt, variable interest rate		5.78%	2.37%
First Citizens Statutory Trust II [Member]
Subordinated Borrowing [Line Items]
Subordinated debentures		$ 7,732	$ 7,732					$ 7,700
Investment in common stock of trust								$ 232
Debt, variable interest rate		6.79%	3.28%
First Citizens Statutory Trust IV [Member]
Subordinated Borrowing [Line Items]
Subordinated debentures		$ 5,155	$ 5,155		$ 5,200
Investment in common stock of trust					$ 155
Debt, variable interest rate		4.89%	1.72%
Futura TPF Trust II [Member]
Subordinated Borrowing [Line Items]
Subordinated debentures		$ 1,997	$ 1,997			2,100
Debt, variable interest rate		4.95%	1.78%
Futura TPF Trust I [Member]
Subordinated Borrowing [Line Items]
Subordinated debentures		$ 2,578	$ 2,578			$ 2,600
Debt, variable interest rate		4.95%	1.78%
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] | Subordinated Note Purchase Agreement [Member]
Subordinated Borrowing [Line Items]
Debt, variable interest rate		2.19%
London Interbank Offered Rate (LIBOR) [Member] | First Citizens Statutory Trust III [Member]
Subordinated Borrowing [Line Items]
Debt, variable interest rate		2.25%
London Interbank Offered Rate (LIBOR) [Member] | First Citizens Statutory Trust II [Member]
Subordinated Borrowing [Line Items]
Debt, variable interest rate		3.15%
London Interbank Offered Rate (LIBOR) [Member] | First Citizens Statutory Trust IV [Member]
Subordinated Borrowing [Line Items]
Debt, variable interest rate		1.60%
London Interbank Offered Rate (LIBOR) [Member] | Futura TPF Trust II [Member]
Subordinated Borrowing [Line Items]
Debt, variable interest rate		1.66%
London Interbank Offered Rate (LIBOR) [Member] | Futura TPF Trust I [Member]
Subordinated Borrowing [Line Items]
Debt, variable interest rate		1.66%