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Loans and Allowance for Credit Losses Allowance for Loan Losses by Portfolio Segment (Details) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance $ 377,337,000 $ 375,941,000 $ 379,156,000 $ 293,404,000 $ 293,404,000
Loans charged off (19,439,000) (13,144,000) (55,388,000) (38,103,000)  
Recoveries of loans previously charged off 8,510,000 2,022,000 20,155,000 7,081,000  
Net loans (charged off) recovered (10,929,000) (11,122,000) (35,233,000) (31,022,000)  
Provision for credit losses 10,245,000 11,929,000 32,749,000 54,910,000  
Ending balance 376,258,000 375,961,000 376,258,000 375,961,000 379,156,000
Loans - Excluding OBS Credit Exposure          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 377,337,000 375,941,000 379,156,000 293,404,000 293,404,000
CECL Day 1 Provision(1)   0   23,444,000  
Initial PCD allowance for credit losses   (1,139,000)      
PCD Loans credit discount       54,767,000  
Loans charged off (19,439,000) (13,144,000) (55,388,000) (38,103,000)  
Recoveries of loans previously charged off 8,510,000 2,022,000 20,155,000 7,081,000  
Net loans (charged off) recovered (10,929,000) (11,122,000) (35,233,000) (31,022,000)  
Provision for credit losses 9,850,000 12,281,000 32,335,000 35,368,000  
Ending balance 376,258,000 375,961,000 376,258,000 375,961,000 379,156,000
Loans - Excluding OBS Credit Exposure | Real estate - commercial mortgage          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 153,383,000 156,165,000 158,181,000 112,565,000 112,565,000
CECL Day 1 Provision(1)   0   6,108,000  
Initial PCD allowance for credit losses   0      
PCD Loans credit discount       32,157,000  
Loans charged off (3,906,000) (2,723,000) (22,414,000) (10,602,000)  
Recoveries of loans previously charged off 4,307,000 107,000 4,814,000 405,000  
Net loans (charged off) recovered 401,000 (2,616,000) (17,600,000) (10,197,000)  
Provision for credit losses 2,010,000 (10,255,000) 15,213,000 2,661,000  
Ending balance 155,794,000 143,294,000 155,794,000 143,294,000 158,181,000
Loans - Excluding OBS Credit Exposure | Commercial and Industrial          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 97,520,000 94,623,000 92,212,000 74,266,000 74,266,000
CECL Day 1 Provision(1)   0   1,484,000  
Initial PCD allowance for credit losses   (1,139,000)      
PCD Loans credit discount       19,730,000  
Loans charged off (5,847,000) (6,256,000) (15,492,000) (16,843,000)  
Recoveries of loans previously charged off 3,205,000 1,008,000 11,785,000 3,052,000  
Net loans (charged off) recovered (2,642,000) (5,248,000) (3,707,000) (13,791,000)  
Provision for credit losses (818,000) 13,128,000 5,555,000 19,675,000  
Ending balance 94,060,000 101,364,000 94,060,000 101,364,000 92,212,000
Loans - Excluding OBS Credit Exposure | Real estate - residential mortgage          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 82,356,000 89,714,000 81,331,000 73,286,000 73,286,000
CECL Day 1 Provision(1)   0   14,922,000  
Initial PCD allowance for credit losses   0      
PCD Loans credit discount       565,000  
Loans charged off (394,000) (1,131,000) (995,000) (1,417,000)  
Recoveries of loans previously charged off 33,000 130,000 410,000 368,000  
Net loans (charged off) recovered (361,000) (1,001,000) (585,000) (1,049,000)  
Provision for credit losses 6,030,000 1,614,000 7,279,000 2,603,000  
Ending balance 88,025,000 90,327,000 88,025,000 90,327,000 81,331,000
Loans - Excluding OBS Credit Exposure | Consumer and Real Estate - Home Equity          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 19,481,000 17,533,000 19,397,000 17,604,000 17,604,000
CECL Day 1 Provision(1)   0   444,000  
Initial PCD allowance for credit losses   0      
PCD Loans credit discount       357,000  
Loans charged off (2,527,000) (2,308,000) (6,605,000) (6,312,000)  
Recoveries of loans previously charged off 726,000 545,000 2,285,000 2,382,000  
Net loans (charged off) recovered (1,801,000) (1,763,000) (4,320,000) (3,930,000)  
Provision for credit losses 3,859,000 1,357,000 6,462,000 2,652,000  
Ending balance 21,539,000 17,127,000 21,539,000 17,127,000 19,397,000
Loans - Excluding OBS Credit Exposure | Real-estate - construction          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 20,736,000 14,610,000 25,140,000 12,295,000 12,295,000
CECL Day 1 Provision(1)   0   486,000  
Initial PCD allowance for credit losses   0      
PCD Loans credit discount       1,958,000  
Loans charged off (5,286,000) 0 (5,387,000) 0  
Recoveries of loans previously charged off 47,000 103,000 228,000 336,000  
Net loans (charged off) recovered (5,239,000) 103,000 (5,159,000) 336,000  
Provision for credit losses (2,068,000) 6,284,000 (6,552,000) 5,922,000  
Ending balance 13,429,000 20,997,000 13,429,000 20,997,000 25,140,000
Loans - Excluding OBS Credit Exposure | Leases and other loans          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 3,861,000 3,296,000 2,895,000 3,388,000 3,388,000
CECL Day 1 Provision(1)   0   0  
Initial PCD allowance for credit losses   0      
PCD Loans credit discount       0  
Loans charged off (1,479,000) (726,000) (4,495,000) (2,929,000)  
Recoveries of loans previously charged off 192,000 129,000 633,000 538,000  
Net loans (charged off) recovered (1,287,000) (597,000) (3,862,000) (2,391,000)  
Provision for credit losses 837,000 153,000 4,378,000 1,855,000  
Ending balance $ 3,411,000 $ 2,852,000 $ 3,411,000 $ 2,852,000 $ 2,895,000