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Income Taxes - Differences Between Tax Basis of Assets and Liabilities (Detail) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Deferred tax assets:
Allowance for credit losses	$ 77,614	$ 76,221
Deferred compensation	3,593	6,783
Stock compensation	3,579	4,981
Non-accrual interest income	1,964	1,798
Real estate owned	311	674
Unrealized loss on investment securities, available-for-sale	69,594	79,847
Loan discounts	2,944	3,323
Investments	23,605	26,042
Accelerated depreciation on premises and equipment	1,190	664
Other	14,486	14,634
Gross deferred tax assets	198,880	214,967
Deferred tax liabilities:
Tax basis on acquisitions	8,326	7,439
Core deposit intangibles	8,555	8,997
FHLB dividends	1,932	1,919
Other	9,947	9,915
Gross deferred tax liabilities	28,760	28,270
Net deferred tax assets	$ 170,120	$ 186,697

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