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Loans and Allowance for Credit Losses - Allowance for Credit Loss Activity (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Balance at beginning of period $ 98,580 $ 106,150 $ 101,494 $ 107,966 $ 107,966
Provision for credit losses on loans 1,989 308 206 4,693  
Charge-offs (3,053) (2,440) (5,593) (10,223) (12,188)
Recoveries 639 303 2,048 1,885  
Net Charge-offs (2,414) (2,137) (3,545) (8,338)  
Balance at End of Period 98,155 104,321 98,155 104,321 101,494
Commercial loans | Commercial real estate          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Balance at beginning of period 30,335 37,077 30,254 37,886 37,886
Provision for credit losses on loans 3,053 (1,441) 2,999 2,498  
Charge-offs 0 0 0 (5,205) (5,205)
Recoveries 0 1 135 458  
Net Charge-offs 0 1 135 (4,747)  
Balance at End of Period 33,388 35,637 33,388 35,637 30,254
Commercial loans | Commercial and industrial          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Balance at beginning of period 32,080 34,735 37,084 34,538 34,538
Provision for credit losses on loans 376 2,184 (4,424) 2,715  
Charge-offs (1,971) (1,308) (2,399) (2,436) (2,436)
Recoveries 146 113 370 907  
Net Charge-offs (1,825) (1,195) (2,029) (1,529)  
Balance at End of Period 30,631 35,724 30,631 35,724 37,084
Commercial loans | Commercial construction          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Balance at beginning of period 6,468 5,347 4,893 5,382 5,382
Provision for credit losses on loans (2,161) (945) (467) (980)  
Charge-offs 0 0 (119) 0 0
Recoveries 9 0 9 0  
Net Charge-offs 9 0 (110) 0  
Balance at End of Period 4,316 4,402 4,316 4,402 4,893
Commercial loans | Business banking          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Balance at beginning of period 11,461 10,883 10,681 12,858 12,858
Provision for credit losses on loans 87 252 1,124 (1,610)  
Charge-offs (462) (179) (784) (373) (1,745)
Recoveries 49 73 114 154  
Net Charge-offs (413) (106) (670) (219)  
Balance at End of Period 11,135 11,029 11,135 11,029 10,681
Consumer loans | Consumer real estate          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Balance at beginning of period 15,527 15,376 15,776 14,663 14,663
Provision for credit losses on loans 415 46 368 1,136  
Charge-offs (220) (616) (772) (1,087) (1,348)
Recoveries 170 40 520 134  
Net Charge-offs (50) (576) (252) (953)  
Balance at End of Period 15,892 14,846 15,892 14,846 15,776
Consumer loans | Other consumer          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Balance at beginning of period 2,709 2,732 2,806 2,639 2,639
Provision for credit losses on loans 219 212 606 934  
Charge-offs (400) (337) (1,519) (1,122) (1,454)
Recoveries 265 76 900 232  
Net Charge-offs (135) (261) (619) (890)  
Balance at End of Period $ 2,793 $ 2,683 $ 2,793 $ 2,683 $ 2,806