v3.26.3
Allowance for Credit Losses on Loans (Allowance for Loan Losses Rollforward Analysis) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Allowance, Beginning Balance     $ 37,236    
Charge-offs     (4,072) $ (14,648) $ (14,735)
Provision for credit losses $ 1,800 $ 6,800 7,400 8,600  
Allowance, Ending Balance 40,488   40,488   37,236
Commercial real estate          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Allowance, Beginning Balance 25,446 19,604 19,766 26,485 26,485
Charge-offs (3,830) (2,991) (3,830) (5,715) (5,715)
Recoveries 0 0 0 200  
Provision for credit losses 2,145 2,230 7,825 (2,127)  
Allowance, Ending Balance 23,761 18,843 23,761 18,843 19,766
Commercial & industrial          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Allowance, Beginning Balance 9,557 13,158 9,750 7,277 7,277
Charge-offs (12) (8,357) (41) (8,681) (8,693)
Recoveries 15 2 86 16  
Provision for credit losses (244) 4,911 (479) 11,102  
Allowance, Ending Balance 9,316 9,714 9,316 9,714 9,750
Total commercial          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Allowance, Beginning Balance 35,003 32,762 29,516 33,762 33,762
Charge-offs (3,842) (11,348) (3,871) (14,396)  
Recoveries 15 2 86 216  
Provision for credit losses 1,901 7,141 7,346 8,975  
Allowance, Ending Balance 33,077 28,557 33,077 28,557 29,516
Residential real estate          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Allowance, Beginning Balance 6,150 6,919 6,270 6,832 6,832
Charge-offs 0 0 0 0 0
Recoveries 0 0 1 0  
Provision for credit losses (135) (296) (256) (209)  
Allowance, Ending Balance 6,015 6,623 6,015 6,623 6,270
Home equity          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Allowance, Beginning Balance 1,225 1,107 1,186 1,031 1,031
Charge-offs 0 0 0 0 0
Recoveries 0 15 1 17  
Provision for credit losses 20 14 58 88  
Allowance, Ending Balance 1,245 1,136 1,245 1,136 1,186
Other          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Allowance, Beginning Balance 193 271 264 335 335
Charge-offs (68) (111) (201) (252) (327)
Recoveries 12 9 36 31  
Provision for credit losses 14 91 52 146  
Allowance, Ending Balance 151 260 151 260 264
Total consumer          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Allowance, Beginning Balance 1,418 1,378 1,450 1,366 1,366
Charge-offs (68) (111) (201) (252)  
Recoveries 12 24 37 48  
Provision for credit losses 34 105 110 234  
Allowance, Ending Balance 1,396 1,396 1,396 1,396 1,450
Financing Receivable          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Allowance, Beginning Balance 42,571 41,059 37,236 41,960 41,960
Charge-offs (3,910) (11,459) (4,072) (14,648)  
Recoveries 27 26 124 264  
Provision for credit losses 1,800 6,950 7,200 9,000  
Allowance, Ending Balance $ 40,488 $ 36,576 $ 40,488 $ 36,576 $ 37,236