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Subordinated Debentures - Additional Information (Detail) - USD ($) $ in Thousands |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 18, 2022 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Jun. 30, 2022 | Apr. 01, 2022
Debt Instrument [Line Items] |  |  |  |  |  |
Subordinated debentures |  | $ 439,246 | $ 439,834 |  |  |
Trust preferred securities, face amount | $ 300,000 |  |  |  |  |
Subordinated notes, interest rate | 3.125% |  |  |  |  |
Net proceeds | $ 296,400 | 0 | 0 | $ 296,324 |  |
Variable Rate Component One | 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 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Floating rate above three-month LIBOR rate | 1.82% |  |  |  |  |
Subordinated debt securities | 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 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Subordinated debentures |  | $ 298,482 | $ 297,750 |  |  |
Fixed rate for first five years |  | 3.125% | 3.125% |  |  |
Subordinated debt securities | Variable Rate Component One | 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 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Floating rate above three-month LIBOR rate |  | 1.82% | 1.82% |  |  |
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 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Percentage of redemption price on principal |  | 100.00% |  |  |  |
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 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Percentage of redemption price on principal |  | 100.00% |  |  |  |
Happy Bancshares, Inc. |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Subordinated debentures |  |  |  |  | $ 167,590 | $ 159,965
Happy Bancshares, Inc. | Subordinated debt securities |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Subordinated debentures |  | $ 144,400 |  |  |  | $ 140,000
Fixed rate for first five years |  |  |  |  |  | 5.50%
Happy Bancshares, Inc. | Subordinated debt securities | Variable Rate Component One |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Floating rate above three-month LIBOR rate |  | 5.345% |  |  |  |

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