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Income Taxes - Reconciliation of Tax Expense at the Federal Statutory Tax Rate (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Income Tax Disclosure [Abstract]      
Tax expense at the federal statutory tax rate $ 57,809 $ 56,689 $ 49,861
Increase (decrease) in tax expense from:      
Tax-exempt income, net (489) (343) (337)
Modified endowment life contracts (424) (497) (487)
Share based compensation excess tax benefit (3,557) (786) (2,905)
Tax deductible dividends paid on ESOP (511) (505) (481)
State tax expense, net of federal tax benefit 6,162 4,945 3,788
Utilization of tax credits:      
New markets tax credits, net of amortization (777) (777) (3,745)
Low-income housing tax credits, net of amortization (1,226) (1,106) (1,024)
Other tax credits, net of amortization (397) (192) (91)
Other, net 2,337 55 (247)
Total income taxes $ 58,927 $ 57,483 $ 44,332