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Subordinated Debentures - Additional Information (Detail) - USD ($) $ in Millions |  | 9 Months Ended |
--- | --- | --- | ---
Jan. 18, 2022 | Sep. 30, 2024 | Apr. 01, 2022
3.125% Fixed to Floating Rate Subordinated Notes due 2032 |  |  |
Debt Instrument [Line Items] |  |  |
Percentage of redemption price on principal |  | 100.00% |
Trust preferred securities, face amount | $ 300.0 |  |
Subordinated notes, Interest rate | 3.125% |  |
Proceeds from issuance of subordinated debentures | $ 296.4 |  |
3.125% Fixed to Floating Rate Subordinated Notes due 2032 | Variable Rate Component One |  |  |
Debt Instrument [Line Items] |  |  |
Floating rate | 1.82% |  |
Subordinated debt securities | Happy Bancshares, Inc. |  |  |
Debt Instrument [Line Items] |  |  |
Debt acquired |  | $ 144.4 | $ 140.0
Fixed rate |  |  | 5.50%
Subordinated debt securities | Happy Bancshares, Inc. | Variable Rate Component One |  |  |
Debt Instrument [Line Items] |  |  |
Floating rate |  | 5.345% |
Subordinated debt securities | 3.125% Fixed to Floating Rate Subordinated Notes due 2032 |  |  |
Debt Instrument [Line Items] |  |  |
Fixed rate |  | 3.125% |
Subordinated debt securities | 3.125% Fixed to Floating Rate Subordinated Notes due 2032 | Variable Rate Component One |  |  |
Debt Instrument [Line Items] |  |  |
Floating rate |  | 1.82% |
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 |  |  |
Debt Instrument [Line Items] |  |  |
Percentage of redemption price on principal |  | 100.00% |

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