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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, 2024
Dec. 31, 2023
Dec. 31, 2022
Income:      
Total income $ 1,239,007 $ 1,235,251 $ 1,078,596
Expense:      
Other non-interest expense 139,309 168,748 180,088
Income before income taxes and equity in undistributed earnings of subsidiaries 1,017,007 1,084,504 797,977
Income tax benefit (248,300) (216,664) (153,694)
Net income 768,707 867,840 644,283
Parent Company      
Income:      
Dividend income from bank subsidiary 600,000 600,000 475,000
Interest income on securities and interest-bearing deposits 11,606 11,259 5,955
Alternative investments income 7,580 1,272 6,416
Other non-interest income 198 908 112
Total income 619,384 613,439 487,483
Expense:      
Interest expense on borrowings 32,253 37,933 34,284
Merger-related expenses 0 2,111 40,314
Other non-interest expense 24,988 31,600 22,592
Total expense 57,241 71,644 97,190
Income before income taxes and equity in undistributed earnings of subsidiaries 562,143 541,795 390,293
Income tax benefit 10,021 15,106 20,799
Equity in undistributed earnings of subsidiaries 196,543 310,939 233,191
Net income $ 768,707 $ 867,840 $ 644,283