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Segment Information - Schedule of Segment Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Segment Reporting Information [Line Items]      
Interest income $ 3,728,033 $ 3,477,597 $ 2,893,114
Interest expense 1,503,981 1,515,062 1,055,250
Net interest income 2,224,052 1,962,535 1,837,864
Provision for credit losses 95,553 101,047 114,390
Non-interest income 501,940 488,325 434,106
Salaries 496,570 465,972 438,812
Commissions and incentive compensation 221,768 215,519 182,101
Benefits 154,954 135,617 127,100
Other segment expenses 638,740 585,616 564,486
Total non-interest expense 1,512,032 1,402,724 1,312,499
Income before taxes 1,118,407 947,089 845,081
Income tax expense 294,563 252,044 222,455
Net income 823,844 695,045 622,626
Total assets at end of year 71,142,046 64,879,668 56,259,934
Operating Segments      
Segment Reporting Information [Line Items]      
Interest income 3,681,895 3,437,582 2,858,005
Interest expense 1,503,981 1,515,062 1,055,250
Net interest income 2,177,914 1,922,520 1,802,755
Provision for credit losses 95,553 101,047 114,390
Non-interest income 595,081 567,318 505,576
Salaries 494,612 464,203 437,146
Commissions and incentive compensation 221,768 215,519 182,101
Benefits 154,954 135,617 127,100
Other segment expenses 687,701 626,363 602,513
Total non-interest expense 1,559,035 1,441,702 1,348,860
Income before taxes 1,118,407 947,089 845,081
Income tax expense 294,563 252,044 222,455
Net income 823,844 695,045 622,626
Total assets at end of year 71,142,046 64,879,668 56,259,934
Operating Segments | Community Banking      
Segment Reporting Information [Line Items]      
Interest income 3,223,220 3,001,500 2,462,103
Interest expense 1,462,186 1,465,237 1,021,128
Net interest income 1,761,034 1,536,263 1,440,975
Provision for credit losses 89,050 88,345 104,895
Non-interest income 310,981 279,845 263,023
Salaries 390,817 364,144 340,993
Commissions and incentive compensation 133,733 130,516 110,986
Benefits 122,421 106,994 100,190
Other segment expenses 553,208 500,327 484,263
Total non-interest expense 1,200,179 1,101,981 1,036,432
Income before taxes 782,786 625,782 562,671
Income tax expense 206,119 167,072 148,612
Net income 576,667 458,710 414,059
Total assets at end of year 57,333,741 52,500,643 44,355,786
Operating Segments | Specialty Finance      
Segment Reporting Information [Line Items]      
Interest income 420,528 405,317 362,035
Interest expense 41,131 49,030 32,991
Net interest income 379,397 356,287 329,044
Provision for credit losses 6,503 12,702 9,495
Non-interest income 129,713 119,339 105,992
Salaries 64,829 61,070 57,024
Commissions and incentive compensation 38,911 36,130 30,395
Benefits 22,167 18,686 17,070
Other segment expenses 96,812 91,479 82,024
Total non-interest expense 222,719 207,365 186,513
Income before taxes 279,888 255,559 239,028
Income tax expense 74,589 69,214 63,484
Net income 205,299 186,345 175,544
Total assets at end of year 12,502,367 11,234,012 10,664,887
Operating Segments | Wealth Management      
Segment Reporting Information [Line Items]      
Interest income 38,147 30,765 33,867
Interest expense 664 795 1,131
Net interest income 37,483 29,970 32,736
Provision for credit losses 0 0 0
Non-interest income 154,387 168,134 136,561
Salaries 38,966 38,989 39,129
Commissions and incentive compensation 49,124 48,873 40,720
Benefits 10,366 9,937 9,840
Other segment expenses 37,681 34,557 36,226
Total non-interest expense 136,137 132,356 125,915
Income before taxes 55,733 65,748 43,382
Income tax expense 13,855 15,758 10,359
Net income 41,878 49,990 33,023
Total assets at end of year 1,305,938 1,145,013 1,239,261
Intersegment Eliminations      
Segment Reporting Information [Line Items]      
Interest income 46,138 40,015 35,109
Interest expense 0 0 0
Net interest income 46,138 40,015 35,109
Provision for credit losses 0 0 0
Non-interest income (93,141) (78,993) (71,470)
Salaries 1,958 1,769 1,666
Commissions and incentive compensation 0 0 0
Benefits 0 0 0
Other segment expenses (48,961) (40,747) (38,027)
Total non-interest expense (47,003) (38,978) (36,361)
Income before taxes 0 0 0
Income tax expense 0 0 0
Net income 0 0 0
Total assets at end of year $ 0 $ 0 $ 0