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Income Taxes - Differences Between Tax Basis of Assets and Liabilities (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Deferred tax assets:
Allowance for credit losses	$ 81,487	$ 81,251
Deferred compensation	4,969	7,619
Stock compensation	6,611	6,803
Non-accrual interest income	1,641	1,463
Real estate owned	70	79
Unrealized loss on investment securities, available-for-sale	88,778	81,493
Loan discounts	4,519	5,119
Investments	27,185	25,789
Other	19,531	14,691
Gross deferred tax assets	234,791	224,307
Deferred tax liabilities:
Accelerated depreciation on premises and equipment	1,275	1,477
Tax basis on acquisitions	4,937	4,061
Core deposit intangibles	10,547	11,021
FHLB dividends	2,522	2,351
Other	12,628	8,233
Gross deferred tax liabilities	31,909	27,143
Net deferred tax assets	$ 202,882	$ 197,164

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