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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 | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024
Short-term Debt [Line Items] |  |  |  |  |
Long-Term Subordinated Debentures, net of unamortized debt issuance costs | $ 73,823 |  | $ 73,823 |  | $ 73,740
Total Subordinated Debentures | 104,172 |  | 104,172 |  | 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 | 433,500 |  | 433,500 |  | 339,000
Maximum indebtedness | $ 465,000 | $ 501,500 | $ 465,000 | $ 501,500 |
Maximum indebtedness, Rate | 4.44% | 5.48% | 4.44% | 5.48% |
End of period balance | $ 433,500 | $ 500,500 | $ 433,500 | $ 500,500 |
End of period balance, Rate | 4.42% | 5.43% | 4.42% | 5.43% |
Average balance | $ 412,545 | $ 440,670 | $ 384,224 | $ 384,679 |
Average rate paid | 4.42% | 5.46% | 4.42% | 5.45% |
Short Term Borrowings, FHLB advances [Member] | Overnight [Member] |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Short-term borrowings | $ 433,500 |  | $ 433,500 |  | $ 339,000
Interest rate on balance | 4.42% |  | 4.42% |  | 4.42%

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