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Loan and Lease Receivables, Impaired Loans and Leases and Allowance for Loan and Lease Losses (Narrative Disclosures) (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2023
USD ($)
loans
Sep. 30, 2022
USD ($)
loans
Sep. 30, 2023
USD ($)
loans
Sep. 30, 2022
USD ($)
loans
Jun. 30, 2023
USD ($)
Mar. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Jun. 30, 2022
USD ($)
Mar. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Financing Receivable, Recorded Investment                    
Guaranteed portion of SBA loans sold to third parties $ 10,700,000 $ 9,200,000 $ 20,500,000 $ 26,600,000            
Total amount of outstanding SBA loans sold 91,100,000   91,100,000       $ 88,500,000      
Loans and leases transferred to third parties total principal amount 39,200,000 $ 25,400,000 93,900,000 $ 70,600,000            
Gain (Loss) Recognized on Participation Interest in Originated Loans     0              
Total amount of outstanding loans transferred to third parties as loan participations 265,200,000   265,200,000       222,900,000      
Total amount of loan participations remaining on the Corporations balance sheet 362,900,000   362,900,000       339,000,000      
Loans in the participation sold portfolio, considered impaired, gross amount 0   0       0      
Loan participations purchased on the Corporation's balance sheet $ 0   $ 0       0      
Number of Loans | loans   0   0            
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | loans 0 0 0 0            
Unfunded commitments, troubled debt restructurings $ 0   $ 0              
Loans and leases receivable, difference between recorded investment and unpaid principal balance 9,000   9,000       26,000      
Financing Receivable, Allowance for Credit Loss 29,331,000 $ 24,143,000 29,331,000 $ 24,143,000     24,230,000 $ 24,104,000   $ 24,336,000
Off-Balance-Sheet, Credit Loss, Liability 1,705,000   1,705,000              
Stockholders' Equity Attributable to Parent 280,758,000 253,004,000 280,758,000 253,004,000 $ 272,632,000 $ 266,581,000 260,640,000 249,923,000 $ 245,051,000 232,422,000
Net deferred tax asset 10,624,000   10,624,000       11,711,000      
Cumulative Effect, Period of Adoption, Adjustment                    
Financing Receivable, Recorded Investment                    
Financing Receivable, Allowance for Credit Loss 1,818,000   1,818,000     484,000        
Stockholders' Equity Attributable to Parent           1,400,000 1,353,000      
Net deferred tax asset           465,000        
Cumulative Effect, Period of Adoption, Adjusted Balance                    
Financing Receivable, Recorded Investment                    
Off-Balance-Sheet, Credit Loss, Liability           $ 1,300,000        
Stockholders' Equity Attributable to Parent             259,287,000      
Commercial real estate — owner occupied                    
Financing Receivable, Recorded Investment                    
Financing Receivable, Allowance for Credit Loss 1,556,000   1,556,000              
Off-Balance-Sheet, Credit Loss, Liability 17,000   17,000              
Commercial real estate — owner occupied | Cumulative Effect, Period of Adoption, Adjustment                    
Financing Receivable, Recorded Investment                    
Financing Receivable, Allowance for Credit Loss $ (204,000)   $ (204,000)              
Commercial and industrial                    
Financing Receivable, Recorded Investment                    
Number of Loans | loans 2   2              
Financing Receivable, Allowance for Credit Loss $ 16,946,000 $ 10,512,000 $ 16,946,000 $ 10,512,000     $ 12,403,000 $ 9,866,000   $ 8,413,000
Off-Balance-Sheet, Credit Loss, Liability 620,000   620,000              
Financing Receivable, Excluding Accrued Interest, Modified, Subsequent Default 716,000   716,000              
Commercial and industrial | Cumulative Effect, Period of Adoption, Adjustment                    
Financing Receivable, Recorded Investment                    
Financing Receivable, Allowance for Credit Loss $ 1,873,000   $ 1,873,000