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Income Taxes - Income Tax Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Components of income tax expense      
Current $ 98,666 $ 56,509 $ 38,402
Deferred 58,168 84,022 38,653
Total income tax expense 156,834 140,531 77,055
Effective Income Tax Rate Reconciliation, Amount      
Tax provision at weighted average statutory rates 148,176 127,046 75,763
State taxes, net of federal benefit 6,306 11,295 0
Non-deductible expenses 4,041 3,652 2,482
Tax exempt interest, net of proration (1,463) (1,606) (1,462)
Excess tax (benefit) deficit from stock-based compensation 75 61 (599)
Other (301) 83 871
Total income tax expense $ 156,834 $ 140,531 $ 77,055
% of pretax income      
Tax provision at weighted average statutory rates 15.00% 15.50% 15.50%
State taxes, net of federal benefit 0.60% 1.40% 0.00%
Non-deductible expenses 0.40% 0.40% 0.50%
Tax exempt interest, net of proration (0.10%) (0.20%) (0.30%)
Excess tax (benefit) deficit from stock-based compensation 0.00% 0.00% (0.10%)
Other 0.00% 0.00% 0.10%
Total income tax expense 15.90% 17.10% 15.70%