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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, 2023
Mar. 31, 2022
Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance $ 269,366,000    
Loans charged off (16,903,000) $ (1,900,000)  
Recoveries of loans previously charged off 2,899,000 2,954,000  
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery 14,004,000 (1,054,000)  
Provision for credit losses 23,333,000 (6,350,000)  
Ending balance 278,695,000   $ 269,366,000
Loans - Excluding OBS Credit Exposure [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance 269,366,000 249,001,000 249,001,000
Loans charged off (16,903,000) (1,900,000)  
Recoveries of loans previously charged off 2,899,000 2,954,000  
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery (14,004,000) 1,054,000  
Provision for credit losses 23,333,000 (6,350,000)  
Ending balance 278,695,000 243,705,000 269,366,000
Loans - Excluding OBS Credit Exposure [Member] | Real estate - commercial mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance 69,456,000 87,970,000 87,970,000
Loans charged off (13,362,000) (152,000)  
Recoveries of loans previously charged off 786,000 112,000  
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery (12,576,000) (40,000)  
Provision for credit losses 9,376,000 (8,077,000)  
Ending balance 66,256,000 79,853,000 69,456,000
Loans - Excluding OBS Credit Exposure [Member] | Commercial and Industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance 70,116,000 67,056,000 67,056,000
Loans charged off (612,000) (227,000)  
Recoveries of loans previously charged off 1,086,000 1,980,000  
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery 474,000 1,753,000  
Provision for credit losses 6,536,000 (2,298,000)  
Ending balance 77,126,000 66,511,000 70,116,000
Loans - Excluding OBS Credit Exposure [Member] | Consumer and Home Equity      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance 26,429,000 19,749,000 19,749,000
Loans charged off (2,206,000) (1,052,000)  
Recoveries of loans previously charged off 661,000 454,000  
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery (1,545,000) (598,000)  
Provision for credit losses 2,419,000 1,062,000  
Ending balance 27,303,000 20,213,000 26,429,000
Loans - Excluding OBS Credit Exposure [Member] | Real estate – residential mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance 83,250,000 54,236,000 54,236,000
Loans charged off 0 0  
Recoveries of loans previously charged off 48,000 222,000  
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery 48,000 222,000  
Provision for credit losses 2,911,000 1,434,000  
Ending balance 86,209,000 55,892,000 83,250,000
Loans - Excluding OBS Credit Exposure [Member] | Real-estate - construction      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance 10,743,000 12,941,000 12,941,000
Loans charged off 0 0  
Recoveries of loans previously charged off 202,000 32,000  
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery 202,000 32,000  
Provision for credit losses 701,000 330,000  
Ending balance 11,646,000 13,303,000 10,743,000
Loans - Excluding OBS Credit Exposure [Member] | Leases and other loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance 9,372,000 7,049,000 7,049,000
Loans charged off (723,000) (469,000)  
Recoveries of loans previously charged off 116,000 154,000  
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery (607,000) (315,000)  
Provision for credit losses 1,390,000 1,199,000  
Ending balance $ 10,155,000 $ 7,933,000 $ 9,372,000