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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 ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Short-term Debt [Line Items] |  |  |  |  |
Long-Term Subordinated Debentures, net of unamortized debt issuance costs | $ 73,864 |  | $ 73,864 |  | $ 73,740
Total Subordinated Debentures | 104,213 |  | 104,213 |  | 104,089
First Citizens Statutory Trust II [Member] |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Subordinated Debentures | 7,732 |  | 7,732 |  | 7,732
First Citizens Statutory Trust III [Member] |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Subordinated Debentures | 12,887 |  | 12,887 |  | 12,887
First Citizens Statutory Trust IV [Member] |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Subordinated Debentures | 5,155 |  | 5,155 |  | 5,155
Futura TPF Trust I [Member] |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Subordinated Debentures | 2,578 |  | 2,578 |  | 2,578
Futura TPF Trust II [Member] |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Subordinated Debentures | 1,997 |  | 1,997 |  | 1,997
Federal Funds Purchased [Member] |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Short-term borrowings | 0 |  | 0 |  | 0
Short Term Borrowings, FHLB advances [Member] |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Short-term borrowings | 232,000 |  | 232,000 |  | 339,000
Maximum indebtedness | $ 412,200 | $ 497,500 | $ 465,000 | $ 501,500 |
Maximum indebtedness, Rate | 4.44% | 5.50% | 4.44% | 5.50% |
End of period balance | $ 232,000 | $ 287,047 | $ 232,000 | $ 287,047 |
End of period balance, Rate | 4.20% | 4.88% | 4.20% | 4.88% |
Average balance | $ 272,985 | $ 388,022 | $ 346,737 | $ 385,801 |
Average rate paid | 4.45% | 5.46% | 4.47% | 5.51% |
Short Term Borrowings, FHLB advances [Member] | Single Maturity Fixed Rate Advances [Member] |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Short-term borrowings | $ 100,000 |  | $ 100,000 |  | $ 0
Interest rate on balance | 4.22% |  | 4.22% |  | 0.00%
Short Term Borrowings, FHLB advances [Member] | Overnight [Member] |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Short-term borrowings | $ 132,000 |  | $ 132,000 |  | $ 339,000
Interest rate on balance | 4.18% |  | 4.18% |  | 4.42%

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