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Income Taxes - Income Tax Expense Differences from the Amount Computed by Applying the U.S. Federal Income Tax Rate (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Amount      
U.S. federal income tax expense computed at the statutory rate $ 109,276 $ 106,831 $ 109,938
State tax, net of federal income taxes and tax credit and refunds 4,989 4,636 4,808
Net investment expense, low-income housing investment (3,451) (2,531) 1,974
Non-taxable or non-deductible items (2,745) (9,383) (4,976)
Total income taxes $ 108,069 $ 99,553 $ 111,744
Percent      
U.S. Federal income tax rate (as a percent) 21.00% 21.00% 21.00%
State income/franchise taxes, net of U.S. federal income tax effects (as a percent) 1.00% 0.90% 0.90%
Net investment in low income housing investments (as a percent) (0.70%) (0.50%) 0.40%
Non-taxable or non-deductible items (as a percent) (0.50%) (1.90%) (1.00%)
Actual tax expense rate (as a percent) 20.80% 19.50% 21.40%