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Parent Company Financial Information - Schedule of Parent Company Information Condensed Statements of Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Income:      
Total income $ 1,470,149 $ 1,239,007 $ 1,235,251
Expense:      
Other non-interest expense 155,996 139,309 168,748
Income before income taxes and equity in undistributed earnings of subsidiaries 1,260,149 1,017,007 1,084,504
Income tax benefit (257,347) (248,300) (216,664)
Net income 1,002,802 768,707 867,840
Gains (losses) on debt extinguishment 9,767 0 698
Parent Company      
Income:      
Dividend income from bank subsidiary 900,000 600,000 600,000
Interest income on intercompany debt securities and interest-bearing deposits 12,881 11,606 11,259
Alternative investments income 17,474 7,580 1,272
Other non-interest income 9,942 198 908
Total income 940,297 619,384 613,439
Expense:      
Interest expense on borrowings 43,430 32,253 37,933
Other non-interest expense 30,545 24,988 33,711
Total expense 73,975 57,241 71,644
Income before income taxes and equity in undistributed earnings of subsidiaries 866,322 562,143 541,795
Income tax benefit 9,360 10,021 15,106
Equity in undistributed earnings of subsidiaries 127,120 196,543 310,939
Net income 1,002,802 768,707 867,840
Gains (losses) on debt extinguishment $ 9,767 $ 0 $ 698