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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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Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
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-Name Accounting Standards Codification
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The net gain (loss) resulting from a sale of loans, including adjustments to record loans classified as held-for-sale at the lower-of-cost-or-market and fair value adjustments to loan held for investment purposes.

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Amount, after valuation allowance, of financing receivable held for sale and not part of disposal group. Excludes loan covered under loss sharing agreement and loan classified as investment in debt security.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
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