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Loans and Allowance for Credit Losses Allowance for Loan Losses by Portfolio Segment (Details) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance $ 379,677,000 $ 297,888,000 $ 379,156,000 $ 293,404,000 $ 293,404,000
Loans charged off (15,916,000) (14,007,000) (35,950,000) (24,959,000)  
Recoveries of loans previously charged off 4,202,000 2,705,000 11,645,000 5,059,000  
Net loans (charged off) recovered (11,714,000) (11,302,000) (24,305,000) (19,900,000)  
Provision for credit losses 8,607,000 32,056,000 22,505,000 42,981,000  
Ending balance 377,337,000 375,941,000 377,337,000 375,941,000 379,156,000
Loans - Excluding OBS Credit Exposure          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 379,677,000 297,888,000 379,156,000 293,404,000 293,404,000
CECL Day 1 Provision(1)   23,444,000   23,444,000  
PCD Loans credit discount   55,906,000   55,906,000  
Loans charged off (15,916,000) (14,007,000) (35,950,000) (24,959,000)  
Recoveries of loans previously charged off 4,202,000 2,705,000 11,645,000 5,059,000  
Net loans (charged off) recovered (11,714,000) (11,302,000) (24,305,000) (19,900,000)  
Provision for credit losses 9,374,000 10,005,000 22,486,000 23,087,000  
Ending balance 377,337,000 375,941,000 377,337,000 375,941,000 379,156,000
Loans - Excluding OBS Credit Exposure | Real estate - commercial mortgage          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 162,146,000 114,492,000 158,181,000 112,565,000 112,565,000
CECL Day 1 Provision(1)   6,108,000   6,108,000  
PCD Loans credit discount   32,157,000   32,157,000  
Loans charged off (6,402,000) (7,853,000) (18,508,000) (7,879,000)  
Recoveries of loans previously charged off 133,000 146,000 507,000 298,000  
Net loans (charged off) recovered (6,269,000) (7,707,000) (18,001,000) (7,581,000)  
Provision for credit losses (2,494,000) 11,115,000 13,203,000 12,916,000  
Ending balance 153,383,000 156,165,000 153,383,000 156,165,000 158,181,000
Loans - Excluding OBS Credit Exposure | Commercial and Industrial          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 96,851,000 76,883,000 92,212,000 74,266,000 74,266,000
CECL Day 1 Provision(1)   1,484,000   1,484,000  
PCD Loans credit discount   20,869,000   20,869,000  
Loans charged off (5,780,000) (2,955,000) (9,645,000) (10,587,000)  
Recoveries of loans previously charged off 2,628,000 796,000 8,580,000 2,044,000  
Net loans (charged off) recovered (3,152,000) (2,159,000) (1,065,000) (8,543,000)  
Provision for credit losses 3,821,000 (2,454,000) 6,373,000 6,547,000  
Ending balance 97,520,000 94,623,000 97,520,000 94,623,000 92,212,000
Loans - Excluding OBS Credit Exposure | Real estate - residential mortgage          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 82,416,000 73,216,000 81,331,000 73,286,000 73,286,000
CECL Day 1 Provision(1)   14,922,000   14,922,000  
PCD Loans credit discount   565,000   565,000  
Loans charged off (258,000) (35,000) (601,000) (286,000)  
Recoveries of loans previously charged off 203,000 122,000 377,000 238,000  
Net loans (charged off) recovered (55,000) 87,000 (224,000) (48,000)  
Provision for credit losses (5,000) 924,000 1,249,000 989,000  
Ending balance 82,356,000 89,714,000 82,356,000 89,714,000 81,331,000
Loans - Excluding OBS Credit Exposure | Consumer and Real Estate - Home Equity          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 19,294,000 16,688,000 19,397,000 17,604,000 17,604,000
CECL Day 1 Provision(1)   444,000   444,000  
PCD Loans credit discount   357,000   357,000  
Loans charged off (1,885,000) (1,766,000) (4,078,000) (4,004,000)  
Recoveries of loans previously charged off 899,000 1,161,000 1,559,000 1,837,000  
Net loans (charged off) recovered (986,000) (605,000) (2,519,000) (2,167,000)  
Provision for credit losses 1,173,000 649,000 2,603,000 1,295,000  
Ending balance 19,481,000 17,533,000 19,481,000 17,533,000 19,397,000
Loans - Excluding OBS Credit Exposure | Real-estate - construction          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 15,900,000 12,966,000 25,140,000 12,295,000 12,295,000
CECL Day 1 Provision(1)   486,000   486,000  
PCD Loans credit discount   1,958,000   1,958,000  
Loans charged off (100,000) 0 (100,000) 0  
Recoveries of loans previously charged off 99,000 233,000 181,000 233,000  
Net loans (charged off) recovered (1,000) 233,000 81,000 233,000  
Provision for credit losses 4,837,000 (1,033,000) (4,485,000) (362,000)  
Ending balance 20,736,000 14,610,000 20,736,000 14,610,000 25,140,000
Loans - Excluding OBS Credit Exposure | Leases and other loans          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 3,070,000 3,643,000 2,895,000 3,388,000 3,388,000
CECL Day 1 Provision(1)   0   0  
PCD Loans credit discount   0   0  
Loans charged off (1,491,000) (1,398,000) (3,018,000) (2,203,000)  
Recoveries of loans previously charged off 240,000 247,000 441,000 409,000  
Net loans (charged off) recovered (1,251,000) (1,151,000) (2,577,000) (1,794,000)  
Provision for credit losses 2,042,000 804,000 3,543,000 1,702,000  
Ending balance $ 3,861,000 $ 3,296,000 $ 3,861,000 $ 3,296,000 $ 2,895,000