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Subordinated Debentures - Preferred Trust Securities and Subordinated Debentures (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 18, 2022
Dec. 31, 2023
Dec. 31, 2022
Debt Instrument [Line Items]      
Subordinated debentures, issued   $ 439,834 $ 440,420
Subordinated notes issued in 2020, due 2030, fixed rate of 5.500% 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]      
Fixed rate for first five years   5.50% 5.50%
Subordinated debentures, issued   $ 142,084 $ 143,400
Subordinated notes issued in 2020, due 2030, fixed rate of 5.500% 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 | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Subordinated debt securities      
Debt Instrument [Line Items]      
Floating rate above three-month LIBOR rate   5.345% 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 | Subordinated debt securities      
Debt Instrument [Line Items]      
Fixed rate for first five years   3.125% 3.125%
Subordinated debentures, issued   $ 297,750 $ 297,020
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 | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate      
Debt Instrument [Line Items]      
Floating rate above three-month LIBOR 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 | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Subordinated debt securities      
Debt Instrument [Line Items]      
Floating rate above three-month LIBOR rate   1.82% 1.82%