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Subordinated Debentures - Preferred Trust Securities and Subordinated Debt Securities (Detail) - USD ($) $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 18, 2022 | Mar. 31, 2025 | Dec. 31, 2024
Debt Instrument [Line Items] |  |  |
Subordinated debentures |  | $ 439,102 | $ 439,246
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] |  |  |
Fixed rate for first five years |  | 5.50% | 5.50%
Subordinated debentures |  | $ 140,440 | $ 140,764
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 | Variable Rate Component One |  |  |
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 | Variable Rate Component One |  |  |
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 | Subordinated debt securities |  |  |
Debt Instrument [Line Items] |  |  |
Fixed rate for first five years |  | 3.125% | 3.125%
Subordinated debentures |  | $ 298,662 | $ 298,482
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 | Variable Rate Component One |  |  |
Debt Instrument [Line Items] |  |  |
Floating rate above three-month LIBOR rate |  | 1.82% | 1.82%

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