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Short-Term and Other Borrowings - Summary of Federal Funds Purchased, Securities Sold Under Agreements to Repurchase and Other Short-term Borrowings (Detail) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Short-term Debt [Line Items] |  |  |  |  |
Long-Term Subordinated Debentures | $ 73,718,000 |  | $ 73,718,000 |  | $ 73,594,000
Total Subordinated Debentures | 104,067,000 |  | 104,067,000 |  | 103,943,000
First Citizens Statutory Trust II [Member] |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Subordinated Debentures | 7,732,000 |  | 7,732,000 |  | 7,732,000
First Citizens Statutory Trust III [Member] |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Subordinated Debentures | 12,887,000 |  | 12,887,000 |  | 12,887,000
First Citizens Statutory Trust IV [Member] |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Subordinated Debentures | 5,082,000 |  | 5,082,000 |  | 5,082,000
Futura TPF Trust I [Member] |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Subordinated Debentures | 2,578,000 |  | 2,578,000 |  | 2,578,000
Futura TPF Trust II [Member] |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Subordinated Debentures | 2,070,000 |  | 2,070,000 |  | 2,070,000
Short Term Borrowings, FHLB advances [Member] |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Short-term borrowings | 287,047,000 |  | 287,047,000 |  | 338,041,000
Maximum indebtedness | 497,500,000 | $ 431,500,000 | 501,500,000 | $ 540,000,000 |
Average balance | $ 388,022,000 | $ 233,547,000 | $ 385,801,000 | $ 282,214,000 |
Average rate paid | 5.35% | 5.51% | 5.42% | 5.03% |
Short Term Borrowings, FHLB advances [Member] | Single Maturity Fixed Rate [Member] |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Short-term borrowings | $ 47,000 |  | $ 47,000 |  | $ 41,000
Interest rate on balance | 1.18% |  | 1.18% |  | 1.25%
Short Term Borrowings, FHLB advances [Member] | Overnight [Member] |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Short-term borrowings | $ 287,000,000 |  | $ 287,000,000 |  | $ 338,000,000
Interest rate on balance | 4.88% |  | 4.88% |  | 5.41%

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