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Loans Receivable - Additional Information (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for credit loss | $ 275,880,000 | $ 288,234,000 | $ 289,669,000 | $ 236,714,000
Deteriorated Credit Quality | Accounting Standards Update 2016-13 | Cumulative Effect Period of Adoption Adjustment |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for credit loss | 76,300,000 | 130,700,000 |  |
Deteriorated Credit Quality | Happy Bancshares, Inc. | Accounting Standards Update 2016-13 | Cumulative Effect Period of Adoption Adjustment |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for credit loss | 76,300,000 | 130,400,000 |  |
Deteriorated Credit Quality | LH-Finance | Accounting Standards Update 2016-13 | Cumulative Effect Period of Adoption Adjustment |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for credit loss |  | 376,100 |  |
Mortgage Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Mortgage loans held for sale | 98,700,000 | 123,400,000 |  |
SBA Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans sold during period | 7,800,000 | 3,700,000 | 4,100,000 |
Gain on sale of guaranteed portion of loans | $ 617,000 | $ 278,000 | $ 183,000 |

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