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Income Taxes - Summary of Differences in Taxes from Continuing Operations Computed at Statutory Rate (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Amount      
Provision at statutory rate $ 176,693 $ 142,892 $ 157,774
State income taxes 32,948 19,619 31,164
New market tax credits 24,881 12,476 7,545
Other tax credit investments (3,439) (2,353) (4,645)
Tax-exempt interest (22,518) (19,439) (18,582)
FDIC premiums 10,792 8,754 7,912
Other nontaxable or nondeductible items 1,762 2,772 2,816
Change in uncertain tax positions 374 (2,811) (832)
Other, net 405 4,292 1,248
Income tax expense $ 172,136 $ 141,250 $ 169,310
Percent      
Provision at statutory rate 21.00% 21.00% 21.00%
State income taxes 3.90% 2.90% 4.10%
New market tax credits (3.00%) (1.80%) (1.00%)
Other tax credit investments (0.40%) (0.30%) (0.60%)
Tax-exempt interest (2.70%) (2.90%) (2.50%)
FDIC premiums 1.30% 1.30% 1.10%
Other nontaxable or nondeductible items 0.20% 0.40% 0.40%
Change in uncertain tax positions 0.00% (0.40%) (0.10%)
Other, net 0.00% 0.60% 0.20%
Income tax expense 20.50% 20.80% 22.50%