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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%