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Loans and Allowance for Credit Losses Allowance for Loan Losses by Portfolio Segment (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance $ 379,156,000 $ 293,404,000 $ 293,404,000
Loans charged off (20,034,000) (10,952,000)  
Recoveries of loans previously charged off 7,443,000 2,354,000  
Net loans (charged off) recovered (12,591,000) (8,598,000)  
Provision for credit losses 13,898,000 10,925,000  
Ending balance 379,677,000 297,888,000 379,156,000
Loans - Excluding OBS Credit Exposure      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance 379,156,000 293,404,000 293,404,000
Loans charged off (20,034,000) (10,952,000)  
Recoveries of loans previously charged off 7,443,000 2,354,000  
Net loans (charged off) recovered (12,591,000) (8,598,000)  
Provision for credit losses 13,112,000 13,082,000  
Ending balance 379,677,000 297,888,000 379,156,000
Loans - Excluding OBS Credit Exposure | Real estate - commercial mortgage      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance 158,181,000 112,565,000 112,565,000
Loans charged off (12,106,000) (26,000)  
Recoveries of loans previously charged off 374,000 152,000  
Net loans (charged off) recovered (11,732,000) 126,000  
Provision for credit losses 15,697,000 1,801,000  
Ending balance 162,146,000 114,492,000 158,181,000
Loans - Excluding OBS Credit Exposure | Commercial and Industrial      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance 92,212,000 74,266,000 74,266,000
Loans charged off (3,865,000) (7,632,000)  
Recoveries of loans previously charged off 5,952,000 1,248,000  
Net loans (charged off) recovered 2,087,000 (6,384,000)  
Provision for credit losses 2,552,000 9,001,000  
Ending balance 96,851,000 76,883,000 92,212,000
Loans - Excluding OBS Credit Exposure | Real estate - residential mortgage      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance 81,331,000 73,286,000 73,286,000
Loans charged off (343,000) (251,000)  
Recoveries of loans previously charged off 174,000 116,000  
Net loans (charged off) recovered (169,000) (135,000)  
Provision for credit losses 1,254,000 65,000  
Ending balance 82,416,000 73,216,000 81,331,000
Loans - Excluding OBS Credit Exposure | Consumer and Real Estate - Home Equity      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance 19,397,000 17,604,000 17,604,000
Loans charged off (2,193,000) (2,238,000)  
Recoveries of loans previously charged off 660,000 676,000  
Net loans (charged off) recovered (1,533,000) (1,562,000)  
Provision for credit losses 1,430,000 646,000  
Ending balance 19,294,000 16,688,000 19,397,000
Loans - Excluding OBS Credit Exposure | Real-estate - construction      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance 25,140,000 12,295,000 12,295,000
Loans charged off 0 0  
Recoveries of loans previously charged off 82,000 0  
Net loans (charged off) recovered 82,000 0  
Provision for credit losses (9,322,000) 671,000  
Ending balance 15,900,000 12,966,000 25,140,000
Loans - Excluding OBS Credit Exposure | Leases and other loans      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance 2,895,000 3,388,000 3,388,000
Loans charged off (1,527,000) (805,000)  
Recoveries of loans previously charged off 201,000 162,000  
Net loans (charged off) recovered (1,326,000) (643,000)  
Provision for credit losses 1,501,000 898,000  
Ending balance $ 3,070,000 $ 3,643,000 $ 2,895,000