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Subordinated Debentures - Preferred Trust Securities and Subordinated Debt Securities (Detail) - USD ($) $ in Thousands |  | 9 Months Ended |
--- | --- | --- | ---
Jan. 18, 2022 | Sep. 30, 2024 | Dec. 31, 2023
Debt Instrument [Line Items] |  |  |
Total |  | $ 439,394 | $ 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 |  | $ 141,096 | 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 | Variable Rate Component One |  |  |
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 | Variable Rate Component One |  |  |
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 |  | $ 298,298 | $ 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 | Variable Rate Component One |  |  |
Debt Instrument [Line Items] |  |  |
Floating rate |  | 1.82% |

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