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Loans Receivable - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Jun. 30, 2022	Apr. 01, 2022	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit loss	$ 288,234,000	$ 289,669,000	$ 236,714,000			$ 245,473,000
Happy Bancshares, Inc.
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable				$ 3,652,620,000	$ 3,657,009,000
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	130,700,000	142,500,000
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	130,400,000	142,100,000
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	415,000
Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans held for sale	123,400,000	79,900,000
SBA Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans sold during period	3,700,000	4,100,000	22,700,000
Gain on sale of guaranteed portion of loans	$ 278,000	$ 183,000	$ 2,400,000

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Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss

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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
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-Name Accounting Standards Codification
-Section 45
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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
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