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Income Taxes - Income Tax Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Components of income tax expense      
Current $ 139,859 $ 98,666 $ 56,509
Deferred (13,246) 58,168 84,022
Total income tax expense 126,613 156,834 140,531
Effective Income Tax Rate Reconciliation, Amount      
Tax provision at weighted average statutory rates 116,389 148,176 127,046
State taxes, net of federal benefit 4,872 6,306 11,295
Non-deductible expenses 4,501 4,041 3,652
Tax exempt interest, net of proration (1,551) (1,463) (1,606)
Excess tax (benefit) deficit from stock-based compensation 145 75 61
Other 2,257 (301) 83
Total income tax expense $ 126,613 $ 156,834 $ 140,531
% of pretax income      
Tax provision at weighted average statutory rates 14.10% 15.00% 15.50%
State taxes, net of federal benefit 0.60% 0.60% 1.40%
Non-deductible expenses 0.50% 0.40% 0.40%
Tax exempt interest, net of proration (0.20%) (0.10%) (0.20%)
Excess tax (benefit) deficit from stock-based compensation 0.00% 0.00% 0.00%
Other 0.40% 0.00% 0.00%
Total income tax expense 15.40% 15.90% 17.10%