v3.26.3
Segment Information - Schedule of Segment Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Segment Reporting [Line Items]          
Interest income $ 1,002,861 $ 963,834 $ 2,891,833 $ 2,771,707  
Interest expense 381,257 396,824 1,093,839 1,131,529  
Net interest income 621,604 567,010 1,797,994 1,640,178  
Provision for credit losses 25,879 21,768 78,607 67,965  
Non-interest income 136,273 130,827 411,684 371,550  
Salaries 128,618 124,623 387,579 371,714  
Commissions and incentive compensation 61,911 56,244 181,781 164,651  
Benefits 40,023 38,801 123,728 114,370  
Other segment expenses 175,113 160,360 492,746 476,844  
Total non-interest expense 405,665 380,028 1,185,834 1,127,579  
Income before taxes 326,333 296,041 945,237 816,184  
Income tax expense 87,279 79,787 245,102 215,364  
Net income 239,054 216,254 700,135 600,820  
Total assets at period end 75,971,620 69,629,638 75,971,620 69,629,638 $ 71,142,046
Operating Segments          
Segment Reporting [Line Items]          
Interest income 991,967 952,408 2,856,646 2,736,622  
Interest expense 381,257 396,824 1,093,839 1,131,529  
Net interest income 610,710 555,584 1,762,807 1,605,093  
Provision for credit losses 25,879 21,768 78,607 67,965  
Non-interest income 159,612 154,391 483,111 441,273  
Salaries 128,273 124,125 386,314 370,220  
Commissions and incentive compensation 61,911 56,244 181,781 164,651  
Benefits 40,023 38,801 123,728 114,370  
Other segment expenses 187,903 172,996 530,251 512,976  
Total non-interest expense 418,110 392,166 1,222,074 1,162,217  
Income before taxes 326,333 296,041 945,237 816,184  
Income tax expense 87,279 79,787 245,102 215,364  
Net income 239,054 216,254 700,135 600,820  
Total assets at period end 75,971,620 69,629,638 75,971,620 69,629,638  
Operating Segments | Community Banking          
Segment Reporting [Line Items]          
Interest income 851,622 838,871 2,449,737 2,408,155  
Interest expense 358,955 386,326 1,036,022 1,099,943  
Net interest income 492,667 452,545 1,413,715 1,308,212  
Provision for credit losses 23,379 20,059 72,029 62,965  
Non-interest income 82,313 82,507 246,801 231,498  
Salaries 100,205 97,900 302,540 293,388  
Commissions and incentive compensation 35,264 33,175 105,719 98,637  
Benefits 31,243 30,577 95,973 90,058  
Other segment expenses 151,555 140,977 423,567 413,177  
Total non-interest expense 318,267 302,629 927,799 895,260  
Income before taxes 233,334 212,364 660,688 581,485  
Income tax expense 64,889 57,753 180,281 153,471  
Net income 168,445 154,611 480,407 428,014  
Total assets at period end 60,142,857 56,437,776 60,142,857 56,437,776  
Operating Segments | Specialty Finance          
Segment Reporting [Line Items]          
Interest income 130,857 107,840 378,065 312,275  
Interest expense 22,197 10,410 57,474 31,228  
Net interest income 108,660 97,430 320,591 281,047  
Provision for credit losses 2,500 1,709 6,578 5,000  
Non-interest income 34,777 32,221 107,101 96,784  
Salaries 18,564 16,464 54,478 47,864  
Commissions and incentive compensation 11,472 10,445 32,788 29,462  
Benefits 6,176 5,775 19,447 16,399  
Other segment expenses 26,912 23,702 78,513 72,237  
Total non-interest expense 63,124 56,386 185,226 165,962  
Income before taxes 77,813 71,556 235,888 206,869  
Income tax expense 18,356 18,990 52,875 55,214  
Net income 59,457 52,566 183,013 151,655  
Total assets at period end 14,527,305 12,187,079 14,527,305 12,187,079  
Operating Segments | Wealth Management          
Segment Reporting [Line Items]          
Interest income 9,488 5,697 28,844 16,192  
Interest expense 105 88 343 358  
Net interest income 9,383 5,609 28,501 15,834  
Provision for credit losses 0 0 0 0  
Non-interest income 42,522 39,663 129,209 112,991  
Salaries 9,504 9,761 29,296 28,968  
Commissions and incentive compensation 15,175 12,624 43,274 36,552  
Benefits 2,604 2,449 8,308 7,913  
Other segment expenses 9,436 8,317 28,171 27,562  
Total non-interest expense 36,719 33,151 109,049 100,995  
Income before taxes 15,186 12,121 48,661 27,830  
Income tax expense 4,034 3,044 11,946 6,679  
Net income 11,152 9,077 36,715 21,151  
Total assets at period end 1,301,458 1,004,783 1,301,458 1,004,783  
Intersegment Eliminations          
Segment Reporting [Line Items]          
Interest income 10,894 11,426 35,187 35,085  
Interest expense 0 0 0 0  
Net interest income 10,894 11,426 35,187 35,085  
Provision for credit losses 0 0 0 0  
Non-interest income (23,339) (23,564) (71,427) (69,723)  
Salaries 345 498 1,265 1,494  
Commissions and incentive compensation 0 0 0 0  
Benefits 0 0 0 0  
Other segment expenses (12,790) (12,636) (37,505) (36,132)  
Total non-interest expense (12,445) (12,138) (36,240) (34,638)  
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