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Income Taxes - Schedule of Income Tax Expense and Effective Income Tax Rate (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Amount      
Income tax expense at statutory federal income tax rate $ 213,923 $ 127,040 $ 146,194
State income tax expense, net of federal income tax benefit 19,636 17,050 25,308
Low Income Housing (15,621) (16,640) (13,193)
Other (3,418) (4,689) (7,841)
Income not subject to tax (13,540) (11,857) (10,477)
FDIC premiums 6,209 7,684 8,589
Executive compensation 4,379 2,965 3,575
Misc non-deductible expenses 2,213 1,916 1,586
Changes in unrecognized tax benefits 4,793 317 1,227
Change in valuation allowance 429 1,047 344
Surrender of BOLI policies 12,901 0 0
Other items, net (3,416) 669 (1,291)
Total income tax expense $ 228,488 $ 125,502 $ 154,021
Percent      
Income tax expense at statutory federal income tax rate 21.00% 21.00% 21.00%
State income tax expense, net of federal income tax benefit 1.90% 2.80% 3.60%
Low Income Housing (1.50%) (2.80%) (1.90%)
Other (0.30%) (0.80%) (1.10%)
Income not subject to tax (1.30%) (2.00%) (1.50%)
FDIC premiums 0.60% 1.30% 1.20%
Executive compensation 0.40% 0.50% 0.50%
Misc non-deductible expenses 0.20% 0.30% 0.20%
Changes in unrecognized tax benefits(2) 0.50% 0.10% 0.20%
Change in valuation allowance 0.00% 0.20% 0.00%
Surrender of BOLI policies 1.30% 0.00% 0.00%
Other items, net (0.40%) 0.10% (0.10%)
Total income tax expense and effective tax rate 22.40% 20.70% 22.10%