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Income Taxes (Effective Income Tax Rate Reconciliation) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Income Tax Disclosure [Abstract]      
U.S. federal statutory tax rate, amount $ 128,603 $ 120,534 $ 102,927
State income taxes, net of federal income tax effect, amount 11,808 11,953 9,703
Effects of cross-border tax laws      
Other, amount 19 0 2
Tax credits      
New market tax credit, amount (4,805) (7,268) (6,924)
Other, amount (2,098) (1,743) (2,650)
Changes in valuation allowances, amount 205 234 1,679
Nontaxable or nondeductible Items      
Tax-exempt interest, amount (7,773) (8,443) (8,755)
Life insurance contracts, amount (5,882) (6,017) (4,020)
Other, amount 5,571 3,908 5,136
Changes in unrecognized tax benefits, amount 674 0 428
Total expense included in net income $ 126,322 $ 113,158 $ 97,526
U.S. federal statutory tax rate 21.00% 21.00% 21.00%
State income taxes, net of federal income tax effect 1.90% 2.10% 2.00%
Effects of cross-border tax laws      
Other 0.00% 0.00% 0.00%
Tax credits      
New market tax credit (0.80%) (1.30%) (1.40%)
Other (0.30%) (0.30%) (0.50%)
Changes in valuation allowances 0.00% 0.00% 0.30%
Nontaxable or nondeductible Items      
Tax-exempt interest (1.30%) (1.50%) (1.80%)
Life insurance contracts (1.00%) (1.00%) (0.80%)
Other 1.00% 0.70% 1.00%
Changes in unrecognized tax benefits 0.10% 0.00% 0.10%
Income tax expense 20.60% 19.70% 19.90%