v3.26.1
Segment Information - Schedule of Segment Information (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Segment Reporting Information [Line Items]      
Interest income $ 232,070 $ 229,147  
Interest expense 71,511 77,092  
Funds transfer pricing, net 0 0  
Net Interest Income 160,559 152,055  
PCL 2,740 5,294  
Net Interest Income After PCL 157,819 146,761  
Service charges on deposit accounts 10,654 10,636  
Bank card and other fees 7,988 7,664  
Mortgage banking, net 8,934 8,771  
Wealth management 10,393 9,543  
Other, net 4,376 5,970  
Internal allocations 0 0  
Total Noninterest Income 42,345 42,584  
Salaries and employee benefits 74,242 68,492  
Services and fees 27,944 26,247  
Other segment expenses 29,973 [1] 29,272 [2]  
Internal allocations 0 0  
Total Noninterest Expense 132,159 124,011  
Income Before Income Taxes 68,005 65,334  
Income taxes 11,890 11,701  
Income From Continuing Operations 56,115 53,633  
Selected Financial Information      
Total assets 18,987,324   $ 18,925,211
Depreciation and amortization 9,643 8,571  
Continuing Operations [Member]      
Selected Financial Information      
Total assets 18,987,324 18,296,203  
Depreciation and amortization 9,643 8,571  
General Banking [Member]      
Segment Reporting Information [Line Items]      
Interest income 228,981 226,158  
Interest expense 70,083 76,297  
Funds transfer pricing, net (1,259) 460  
Net Interest Income 157,639 150,321  
PCL 2,513 5,297  
Net Interest Income After PCL 155,126 145,024  
Service charges on deposit accounts 10,585 10,615  
Bank card and other fees 7,957 7,625  
Mortgage banking, net 8,934 8,771  
Wealth management 153 181  
Other, net 4,183 5,822  
Internal allocations (96) (96)  
Total Noninterest Income 31,812 33,014  
Salaries and employee benefits 68,096 62,871  
Services and fees 27,249 25,599  
Other segment expenses 29,436 [1] 28,847 [2]  
Internal allocations (1,881) (1,482)  
Total Noninterest Expense 122,900 115,835  
Income Before Income Taxes 64,038 62,203  
Income taxes 10,906 10,922  
Income From Continuing Operations 53,132 51,281  
Selected Financial Information      
Total assets 18,774,135 18,098,364  
Depreciation and amortization 9,578 8,509  
Wealth Management [Member]      
Segment Reporting Information [Line Items]      
Interest income 3,089 2,989  
Interest expense 1,428 795  
Funds transfer pricing, net 1,259 (460)  
Net Interest Income 2,920 1,734  
PCL 227 (3)  
Net Interest Income After PCL 2,693 1,737  
Service charges on deposit accounts 69 21  
Bank card and other fees 31 39  
Mortgage banking, net 0 0  
Wealth management 10,240 9,362  
Other, net 193 148  
Internal allocations 96 96  
Total Noninterest Income 10,533 9,570  
Salaries and employee benefits 6,146 5,621  
Services and fees 695 648  
Other segment expenses 537 [1] 425 [2]  
Internal allocations 1,881 1,482  
Total Noninterest Expense 9,259 8,176  
Income Before Income Taxes 3,967 3,131  
Income taxes 984 779  
Income From Continuing Operations 2,983 2,352  
Selected Financial Information      
Total assets 213,189 197,839  
Depreciation and amortization 65 62  
Internal Allocations [Member] | General Banking [Member]      
Segment Reporting Information [Line Items]      
Other, net 4,279 5,918  
Internal Allocations [Member] | Wealth Management [Member]      
Segment Reporting Information [Line Items]      
Other, net $ 97 $ 52  
[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.