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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% |  |  |  |  |  |

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