v3.26.1
Segment Information - Schedule of Segment Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Segment Reporting [Line Items]          
Interest income $ 961,412 $ 920,908 $ 1,888,972 $ 1,807,873  
Interest expense 364,046 374,214 712,582 734,705  
Net interest income 597,366 546,694 1,176,390 1,073,168  
Provision for credit losses 23,134 22,234 52,728 46,197  
Non-interest income 141,269 124,089 275,411 240,723  
Salaries 129,875 123,174 258,961 247,091  
Commissions and incentive compensation 62,463 55,871 119,870 108,407  
Benefits 41,751 40,496 83,705 75,569  
Other segment expenses 163,448 161,920 317,633 316,484  
Total non-interest expense 397,537 381,461 780,169 747,551  
Income before taxes 317,964 267,088 618,904 520,143  
Income tax expense 84,271 71,561 157,823 135,577  
Net income 233,693 195,527 461,081 384,566  
Total assets at period end 74,668,135 68,983,318 74,668,135 68,983,318 $ 71,142,046
Operating Segments          
Segment Reporting [Line Items]          
Interest income 948,119 908,017 1,864,679 1,784,214  
Interest expense 364,046 374,214 712,582 734,705  
Net interest income 584,073 533,803 1,152,097 1,049,509  
Provision for credit losses 23,134 22,234 52,728 46,197  
Non-interest income 166,609 148,560 323,499 286,882  
Salaries 129,469 122,643 258,041 246,095  
Commissions and incentive compensation 62,463 55,871 119,870 108,407  
Benefits 41,751 40,496 83,705 75,569  
Other segment expenses 175,901 174,031 342,348 339,980  
Total non-interest expense 409,584 393,041 803,964 770,051  
Income before taxes 317,964 267,088 618,904 520,143  
Income tax expense 84,271 71,561 157,823 135,577  
Net income 233,693 195,527 461,081 384,566  
Total assets at period end 74,668,135 68,983,318 74,668,135 68,983,318  
Operating Segments | Community Banking          
Segment Reporting [Line Items]          
Interest income 816,613 800,316 1,598,115 1,569,284  
Interest expense 346,163 363,660 677,067 713,617  
Net interest income 470,450 436,656 921,048 855,667  
Provision for credit losses 21,369 20,478 48,650 42,906  
Non-interest income 86,606 75,498 164,488 148,991  
Salaries 100,759 96,902 202,335 195,488  
Commissions and incentive compensation 37,327 33,325 70,455 65,462  
Benefits 32,487 32,107 64,730 59,481  
Other segment expenses 139,405 139,710 272,012 272,200  
Total non-interest expense 309,978 302,044 609,532 592,631  
Income before taxes 225,709 189,632 427,354 369,121  
Income tax expense 64,278 50,499 115,392 95,718  
Net income 161,431 139,133 311,962 273,403  
Total assets at period end 59,218,299 55,924,843 59,218,299 55,924,843  
Operating Segments | Specialty Finance          
Segment Reporting [Line Items]          
Interest income 122,632 102,737 247,208 204,435  
Interest expense 17,784 10,427 35,277 20,818  
Net interest income 104,848 92,310 211,931 183,617  
Provision for credit losses 1,765 1,756 4,078 3,291  
Non-interest income 36,591 33,524 72,324 64,563  
Salaries 17,891 15,638 35,914 31,400  
Commissions and incentive compensation 11,454 9,976 21,316 19,017  
Benefits 6,631 5,906 13,271 10,624  
Other segment expenses 26,919 25,090 51,601 48,535  
Total non-interest expense 62,895 56,610 122,102 109,576  
Income before taxes 76,779 67,468 158,075 135,313  
Income tax expense 16,316 18,672 34,519 36,224  
Net income 60,463 48,796 123,556 99,089  
Total assets at period end 14,138,775 12,062,568 14,138,775 12,062,568  
Operating Segments | Wealth Management          
Segment Reporting [Line Items]          
Interest income 8,874 4,964 19,356 10,495  
Interest expense 99 127 238 270  
Net interest income 8,775 4,837 19,118 10,225  
Provision for credit losses 0 0 0 0  
Non-interest income 43,412 39,538 86,687 73,328  
Salaries 10,819 10,103 19,792 19,207  
Commissions and incentive compensation 13,682 12,570 28,099 23,928  
Benefits 2,633 2,483 5,704 5,464  
Other segment expenses 9,577 9,231 18,735 19,245  
Total non-interest expense 36,711 34,387 72,330 67,844  
Income before taxes 15,476 9,988 33,475 15,709  
Income tax expense 3,677 2,390 7,912 3,635  
Net income 11,799 7,598 25,563 12,074  
Total assets at period end 1,311,061 995,907 1,311,061 995,907  
Intersegment Eliminations          
Segment Reporting [Line Items]          
Interest income 13,293 12,891 24,293 23,659  
Interest expense 0 0 0 0  
Net interest income 13,293 12,891 24,293 23,659  
Provision for credit losses 0 0 0 0  
Non-interest income (25,340) (24,471) (48,088) (46,159)  
Salaries 406 531 920 996  
Commissions and incentive compensation 0 0 0 0  
Benefits 0 0 0 0  
Other segment expenses (12,453) (12,111) (24,715) (23,496)  
Total non-interest expense (12,047) (11,580) (23,795) (22,500)  
Income before taxes 0 0 0 0  
Income tax expense 0 0 0 0  
Net income 0 0 0 0  
Total assets at period end $ 0 $ 0 $ 0 $ 0