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Loans Receivable - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for credit loss | $ 290,294 | $ 287,169 | $ 288,234 | $ 289,669
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 | 90,500 |  | 130,700 |
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 | 90,100 |  |  |
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 | 362 |  |  |
Mortgage Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Mortgage loans held for sale | 95,200 |  | $ 123,400 |
SBA Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans sold during period | 2,700 | 2,200 |  |
Gain on sale of guaranteed portion of loans | $ 198 | $ 139 |  |

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