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Subordinated Debentures - Schedule of Subordinated Debentures (Parenthetical) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Subordinated Note [Member] |  |
Subordinated Borrowing [Line Items] |  |
Basis spread on variable rate | 3.25% | 3.25%
Subordinated Note [Member] | December 31, 2031 [Member] |  |
Subordinated Borrowing [Line Items] |  |
Maturities of subordinated debt | $ 75,000 |
Subordinated Note [Member] | SOFR [Member] |  |
Subordinated Borrowing [Line Items] |  |
Basis spread on variable rate | 2.19% |
First Citizens Statutory Trust II [Member] |  |
Subordinated Borrowing [Line Items] |  |
Basis spread on variable rate | 8.81% | 6.79%
First Citizens Statutory Trust II [Member] | March 26, 2033 [Member] |  |
Subordinated Borrowing [Line Items] |  |
Maturities of subordinated debt | $ 7,732 |
First Citizens Statutory Trust II [Member] | SOFR [Member] |  |
Subordinated Borrowing [Line Items] |  |
Basis spread on variable rate | 3.15% |
First Citizens Statutory Trust III [Member] |  |
Subordinated Borrowing [Line Items] |  |
Basis spread on variable rate | 7.91% | 5.78%
First Citizens Statutory Trust III [Member] | September 20, 2034 [Member] |  |
Subordinated Borrowing [Line Items] |  |
Maturities of subordinated debt | $ 12,887 |
First Citizens Statutory Trust III [Member] | SOFR [Member] |  |
Subordinated Borrowing [Line Items] |  |
Basis spread on variable rate | 2.25% |
First Citizens Statutory Trust IV [Member] |  |
Subordinated Borrowing [Line Items] |  |
Basis spread on variable rate | 7.27% | 4.89%
First Citizens Statutory Trust IV [Member] | March 23, 2037 [Member] |  |
Subordinated Borrowing [Line Items] |  |
Maturities of subordinated debt | $ 5,155 |
First Citizens Statutory Trust IV [Member] | SOFR [Member] |  |
Subordinated Borrowing [Line Items] |  |
Basis spread on variable rate | 1.60% |
Futura TPF Trust II [Member] |  |
Subordinated Borrowing [Line Items] |  |
Basis spread on variable rate | 7.33% | 4.95%
Futura TPF Trust II [Member] | June 15, 2035 [Member] |  |
Subordinated Borrowing [Line Items] |  |
Maturities of subordinated debt | $ 2,070 |
Futura TPF Trust II [Member] | 3-Month LIBOR [Member] |  |
Subordinated Borrowing [Line Items] |  |
Basis spread on variable rate | 1.66% |
Futura TPF Trust I [Member] |  |
Subordinated Borrowing [Line Items] |  |
Basis spread on variable rate | 7.33% | 4.95%
Futura TPF Trust I [Member] | June 15, 2035 [Member] |  |
Subordinated Borrowing [Line Items] |  |
Maturities of subordinated debt | $ 2,578 |
Futura TPF Trust I [Member] | SOFR [Member] |  |
Subordinated Borrowing [Line Items] |  |
Basis spread on variable rate | 1.66% |

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- Definition The cash outflow for a long-term borrowing where lender is placed in a lien position behind debt having a higher priority of repayment (senior) in case of liquidation of the entity's assets as it matures. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-15 + Details
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