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Subordinated Debentures - Preferred Trust Securities and Subordinated Debt Securities (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Jan. 18, 2022
Mar. 31, 2024
Dec. 31, 2023
Debt Instrument [Line Items]      
Total   $ 439,688 $ 439,834
Subordinated notes, net of issuance costs, issued in 2020, due 2030, fixed rate of 5.50% during the first five years and at a floating rate of 534.5 basis points above the then three-month SOFR rate, reset quarterly, thereafter, callable in 2025 without penalty | Subordinated debt securities      
Debt Instrument [Line Items]      
Total   $ 141,756 142,084
Fixed rate   5.50%  
Subordinated notes, net of issuance costs, issued in 2020, due 2030, fixed rate of 5.50% during the first five years and at a floating rate of 534.5 basis points above the then three-month SOFR rate, reset quarterly, thereafter, callable in 2025 without penalty | Subordinated debt securities | SOFR      
Debt Instrument [Line Items]      
Floating rate   5.345%  
Subordinated notes, net of issuance costs, issued in 2022, due 2032, fixed rate of 3.125% during the first five years and at a floating rate of 182 basis points above the then three-month SOFR rate, reset quarterly, thereafter, callable in 2027 without penalty | SOFR      
Debt Instrument [Line Items]      
Floating rate 1.82%    
Subordinated notes, net of issuance costs, issued in 2022, due 2032, fixed rate of 3.125% during the first five years and at a floating rate of 182 basis points above the then three-month SOFR rate, reset quarterly, thereafter, callable in 2027 without penalty | Subordinated debt securities      
Debt Instrument [Line Items]      
Total   $ 297,932 $ 297,750
Fixed rate   3.125%  
Subordinated notes, net of issuance costs, issued in 2022, due 2032, fixed rate of 3.125% during the first five years and at a floating rate of 182 basis points above the then three-month SOFR rate, reset quarterly, thereafter, callable in 2027 without penalty | Subordinated debt securities | SOFR      
Debt Instrument [Line Items]      
Floating rate   1.82%