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Subordinated Debentures - Additional Information (Detail) - USD ($) $ in Thousands |  |  | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jan. 18, 2022 | Apr. 03, 2017 | Sep. 30, 2022 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Jun. 30, 2022 | Apr. 01, 2022
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Subordinated debentures |  |  |  | $ 439,834 | $ 440,420 |  |  |
Retirement of subordinated debentures |  |  |  | 0 | 300,000 | $ 0 |  |
Trust preferred securities, face amount | $ 300,000 |  |  |  |  |  |  |
Subordinated notes, interest rate | 3.125% |  |  |  |  |  |  |
Net proceeds | $ 296,400 |  |  | 0 | 296,324 | $ 0 |  |
Happy Bancshares, Inc. |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Subordinated debentures |  |  |  |  |  |  | $ 167,590 | $ 159,965
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | 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% |  |  |  |  |  |  |
Trust Preferred Securities |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Face value of company held trust preferred securities |  |  |  | 23,200 |  |  |  |
Retirement of subordinated debentures |  |  | $ 73,300 |  |  |  |  |
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 |  |  |  | $ 297,750 | $ 297,020 |  |  |
Fixed rate for first five years |  |  |  | 3.125% | 3.125% |  |  |
Subordinated debt securities | Happy Bancshares, Inc. |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Subordinated debentures |  |  |  | $ 144,400 |  |  |  | $ 140,000
Fixed rate for first five years |  |  |  |  |  |  |  | 5.50%
Subordinated debt securities | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | 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 debt securities | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Happy Bancshares, Inc. |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Floating rate above three-month LIBOR rate |  |  | 5.345% |  |  |  |  |
5.500% Subordinated Notes due 2030 |  |  |  |  |  |  |  |
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% |  |  |  |
5.625% Subordinated Notes due 2027 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Percentage of redemption price on principal |  |  |  | 100.00% |  |  |  |
Trust preferred securities, face amount |  | $ 300,000 |  |  |  |  |  |
Subordinated notes, interest rate |  | 5.625% |  |  |  |  |  |
Net proceeds |  | $ 297,000 |  |  |  |  |  |
5.625% Subordinated Notes due 2027 | LIBOR |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Floating rate above three-month LIBOR rate |  | 3.575% |  |  |  |  |  |

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