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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%

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