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Allowance for Credit Losses on Loans (Allowance for Loan Losses Rollforward Analysis) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Allowance, Beginning Balance     $ 37,236    
Charge-offs     (162) $ (3,189) $ (14,735)
Provision for credit losses $ 1,600 $ 600 5,600 1,800  
Allowance, Ending Balance 42,571   42,571   37,236
Commercial real estate          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Allowance, Beginning Balance 24,031 25,207 19,766 26,485 26,485
Charge-offs 0 (274) 0 (2,724) (5,715)
Recoveries 0 0 0 200  
Provision for credit losses 1,415 (5,329) 5,680 (4,357)  
Allowance, Ending Balance 25,446 19,604 25,446 19,604 19,766
Commercial & industrial          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Allowance, Beginning Balance 9,647 7,656 9,750 7,277 7,277
Charge-offs (12) (317) (29) (324) (8,693)
Recoveries 12 10 71 14  
Provision for credit losses (90) 5,809 (235) 6,191  
Allowance, Ending Balance 9,557 13,158 9,557 13,158 9,750
Total commercial          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Allowance, Beginning Balance 33,678 32,863 29,516 33,762 33,762
Charge-offs (12) (591) (29) (3,048)  
Recoveries 12 10 71 214  
Provision for credit losses 1,325 480 5,445 1,834  
Allowance, Ending Balance 35,003 32,762 35,003 32,762 29,516
Residential real estate          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Allowance, Beginning Balance 6,003 6,776 6,270 6,832 6,832
Charge-offs 0 0 0 0 0
Recoveries 0 0 1 0  
Provision for credit losses 147 143 (121) 87  
Allowance, Ending Balance 6,150 6,919 6,150 6,919 6,270
Home equity          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Allowance, Beginning Balance 1,194 1,057 1,186 1,031 1,031
Charge-offs 0 0 0 0 0
Recoveries 0 1 1 2  
Provision for credit losses 31 49 38 74  
Allowance, Ending Balance 1,225 1,107 1,225 1,107 1,186
Other          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Allowance, Beginning Balance 251 360 264 335 335
Charge-offs (66) (76) (133) (141) (327)
Recoveries 11 9 24 22  
Provision for credit losses (3) (22) 38 55  
Allowance, Ending Balance 193 271 193 271 264
Total consumer          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Allowance, Beginning Balance 1,445 1,417 1,450 1,366 1,366
Charge-offs (66) (76) (133) (141)  
Recoveries 11 10 25 24  
Provision for credit losses 28 27 76 129  
Allowance, Ending Balance 1,418 1,378 1,418 1,378 1,450
Financing Receivable          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Allowance, Beginning Balance 41,126 41,056 37,236 41,960 41,960
Charge-offs (78) (667) (162) (3,189)  
Recoveries 23 20 97 238  
Provision for credit losses 1,500 650 5,400 2,050  
Allowance, Ending Balance $ 42,571 $ 41,059 $ 42,571 $ 41,059 $ 37,236