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Income Taxes (Income Tax Computed by Applying U.S. Federal Statutory Income Tax Rate) (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Income Tax Disclosure [Abstract]      
Income tax expense computed at the statutory rate $ 146,153 $ 149,598 $ 140,454
Effect of tax-exempt interest (38,498) (43,114) (50,602)
Net tax benefit from stock-based compensation (3,795) (894) (4,602)
Tax benefit on dividends paid in our 401k plan (2,281) (2,135) (1,854)
Non-deductible FDIC premiums 5,943 5,263 3,277
Non-deductible meals and entertainment 1,861 1,692 683
Non-deductible compensation 1,629 2,591 2,250
Other 2,413 1,399 71
Income tax expense, as reported $ 113,425 $ 114,400 $ 89,677