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 Information [Line Items]          
Interest income $ 237,433 $ 237,428 $ 469,503 $ 466,575  
Interest expense 71,803 78,672 143,314 155,764  
Funds transfer pricing, net 0 0 0  
Net Interest Income 165,630 158,756 326,189 310,811  
PCL (3,244) 4,676 (504) 9,970  
Net Interest Income After PCL 168,874 154,080 326,693 300,841  
Service charges on deposit accounts 10,375 10,585 21,029 21,221  
Bank card and other fees 8,743 8,754 16,731 16,418  
Mortgage banking, net 8,914 8,602 17,848 17,373  
Wealth management 10,922 9,638 21,315 19,181  
Other, net 3,617 2,311 7,993 8,281  
Internal allocations 0 0 0  
Total Noninterest Income 42,571 39,890 84,916 82,474  
Salaries and employee benefits 72,990 68,298 147,232 136,790  
Services and fees 29,748 26,998 57,692 53,245  
Other segment expenses 30,945 [1] 29,818 [2] 60,918 [3] 59,090 [4]  
Internal allocations 0 0 0  
Total Noninterest Expense 133,683 125,114 265,842 249,125  
Income Before Income Taxes 77,762 68,856 145,767 134,190  
Income taxes 14,240 13,015 26,130 24,716  
Income From Continuing Operations 63,522 55,841 119,637 109,474  
Selected Financial Information          
Total assets 19,192,470   19,192,470   $ 18,925,211
Depreciation and amortization     20,118 18,485  
Continuing Operations [Member]          
Selected Financial Information          
Total assets 19,192,470 18,615,659 19,192,470 18,615,659  
Depreciation and amortization 10,475 9,914 20,118 18,485  
General Banking [Member]          
Segment Reporting Information [Line Items]          
Interest income 234,175 234,301 463,156 460,459  
Interest expense 70,384 77,799 140,467 154,096  
Funds transfer pricing, net (1,194) 253 (2,453) 713  
Net Interest Income 162,597 156,755 320,236 307,076  
PCL (3,240) 4,693 (727) 9,990  
Net Interest Income After PCL 165,837 152,062 320,963 297,086  
Service charges on deposit accounts 10,299 10,562 20,884 21,177  
Bank card and other fees 8,742 8,716 16,699 16,341  
Mortgage banking, net 8,914 8,602 17,848 17,373  
Wealth management 161 196 314 377  
Other, net 3,397 2,164 7,580 7,986  
Internal allocations (131) (93) (227) (189)  
Total Noninterest Income 31,513 30,240 63,325 63,254  
Salaries and employee benefits 67,304 62,831 135,400 125,702  
Services and fees 29,022 26,357 56,271 51,956  
Other segment expenses 30,399 [1] 29,425 [2] 59,835 [3] 58,272 [4]  
Internal allocations (1,873) (1,486) (3,754) (2,968)  
Total Noninterest Expense 124,852 117,127 247,752 232,962  
Income Before Income Taxes 72,498 65,175 136,536 127,378  
Income taxes 12,936 12,100 23,842 23,022  
Income From Continuing Operations 59,562 53,075 112,694 104,356  
Selected Financial Information          
Total assets 18,969,028 18,417,303 18,969,028 18,417,303  
Depreciation and amortization 10,411 9,851 19,989 18,360  
Wealth Management [Member]          
Segment Reporting Information [Line Items]          
Interest income 3,258 3,127 6,347 6,116  
Interest expense 1,419 873 2,847 1,668  
Funds transfer pricing, net 1,194 (253) 2,453 (713)  
Net Interest Income 3,033 2,001 5,953 3,735  
PCL (4) (17) 223 (20)  
Net Interest Income After PCL 3,037 2,018 5,730 3,755  
Service charges on deposit accounts 76 23 145 44  
Bank card and other fees 1 38 32 77  
Mortgage banking, net 0 0 0  
Wealth management 10,761 9,442 21,001 18,804  
Other, net 220 147 413 295  
Internal allocations 131 93 227 189  
Total Noninterest Income 11,058 9,650 21,591 19,220  
Salaries and employee benefits 5,686 5,467 11,832 11,088  
Services and fees 726 641 1,421 1,289  
Other segment expenses 546 [1] 393 [2] 1,083 [3] 818 [4]  
Internal allocations 1,873 1,486 3,754 2,968  
Total Noninterest Expense 8,831 7,987 18,090 16,163  
Income Before Income Taxes 5,264 3,681 9,231 6,812  
Income taxes 1,304 915 2,288 1,694  
Income From Continuing Operations 3,960 2,766 6,943 5,118  
Selected Financial Information          
Total assets 223,442 198,356 223,442 198,356  
Depreciation and amortization 64 63 129 125  
Internal Allocations [Member] | General Banking [Member]          
Segment Reporting Information [Line Items]          
Other, net 3,528 2,257 7,807 8,175  
Internal Allocations [Member] | Wealth Management [Member]          
Segment Reporting Information [Line Items]          
Other, net $ 89 $ 54 $ 186 $ 106  
[1] Other segment expenses for the General Banking Segment include net occupancy-premises, equipment expense, FDIC assessment expense, other real estate expense, net, loan expense and other miscellaneous expense. Other segment expenses for the Wealth Management Segment include net occupancy-premises, equipment expense, FDIC assessment expense, loan expense and other miscellaneous expense.
[2] Other segment expenses for the General Banking Segment include net occupancy-premises, equipment expense, FDIC assessment expense, other real estate expense, net, loan expense and other miscellaneous expense. Other segment expenses for the Wealth Management Segment include net occupancy-premises, equipment expense, FDIC assessment expense, loan expense and other miscellaneous expense.
[3] Other segment expenses for the General Banking Segment include net occupancy-premises, equipment expense, FDIC assessment expense, other real estate expense, net, loan expense and other miscellaneous expense. Other segment expenses for the Wealth Management Segment include net occupancy-premises, equipment expense, FDIC assessment expense, loan expense and other miscellaneous expense.
[4] Other segment expenses for the General Banking Segment include net occupancy-premises, equipment expense, FDIC assessment expense, other real estate expense, net, loan expense and other miscellaneous expense. Other segment expenses for the Wealth Management Segment include net occupancy-premises, equipment expense, FDIC assessment expense, loan expense and other miscellaneous expense.