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Subordinated Debentures - Schedule of Subordinated Debentures (Parenthetical) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023
Subordinated Note [Member] |  |
Subordinated Borrowing [Line Items] |  |
Basis spread on variable rate | 2.19% |
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] |
Debt instrument, variable interest rate percentage | 3.25% | 3.25%
Net of unamortized debt issuance costs | $ 1,260 | $ 1,406
Subordinated Note [Member] | December 31, 2031 [Member] |  |
Subordinated Borrowing [Line Items] |  |
Maturities of subordinated debt | $ 75,000 |
First Citizens Statutory Trust II [Member] |  |
Subordinated Borrowing [Line Items] |  |
Basis spread on variable rate | 3.15% |
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] |
Debt instrument, variable interest rate percentage | 8.07% | 8.81%
First Citizens Statutory Trust II [Member] | March 26, 2033 [Member] |  |
Subordinated Borrowing [Line Items] |  |
Maturities of subordinated debt | $ 7,732 |
First Citizens Statutory Trust III [Member] |  |
Subordinated Borrowing [Line Items] |  |
Basis spread on variable rate | 2.25% |
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] |
Debt instrument, variable interest rate percentage | 7.32% | 7.91%
First Citizens Statutory Trust III [Member] | September 20, 2034 [Member] |  |
Subordinated Borrowing [Line Items] |  |
Maturities of subordinated debt | $ 12,887 |
First Citizens Statutory Trust IV [Member] |  |
Subordinated Borrowing [Line Items] |  |
Basis spread on variable rate | 1.60% |
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] |
Debt instrument, variable interest rate percentage | 6.81% | 7.27%
First Citizens Statutory Trust IV [Member] | March 23, 2037 [Member] |  |
Subordinated Borrowing [Line Items] |  |
Maturities of subordinated debt | $ 5,155 |
Futura TPF Trust I [Member] |  |
Subordinated Borrowing [Line Items] |  |
Basis spread on variable rate | 1.66% |
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] |
Debt instrument, variable interest rate percentage | 6.87% | 7.33%
Futura TPF Trust I [Member] | June 15, 2035 [Member] |  |
Subordinated Borrowing [Line Items] |  |
Maturities of subordinated debt | $ 2,578 |
Futura TPF Trust II [Member] |  |
Subordinated Borrowing [Line Items] |  |
Basis spread on variable rate | 1.66% |
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] |
Debt instrument, variable interest rate percentage | 6.87% | 7.33%
Net of purchase discount | $ 73 |
Futura TPF Trust II [Member] | June 15, 2035 [Member] |  |
Subordinated Borrowing [Line Items] |  |
Maturities of subordinated debt | $ 2,070 |

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