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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 6 Months Ended
Jun. 30, 2023
USD ($)
loans
Jun. 30, 2022
USD ($)
loans
Jun. 30, 2023
USD ($)
loans
Jun. 30, 2022
USD ($)
loans
Mar. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Mar. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Financing Receivable, Recorded Investment                
Guaranteed portion of SBA loans sold to third parties $ 4,900,000 $ 11,900,000 $ 9,800,000 $ 17,400,000        
Total amount of outstanding SBA loans sold 87,700,000   87,700,000     $ 88,500,000    
Loans and leases transferred to third parties total principal amount 32,000,000 $ 23,000,000 54,700,000 $ 45,200,000        
Gain (Loss) Recognized on Participation Interest in Originated Loans     0          
Total amount of outstanding loans transferred to third parties as loan participations 252,700,000   252,700,000     222,900,000    
Total amount of loan participations remaining on the Corporations balance sheet 355,700,000   355,700,000     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 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 6,000   6,000     26,000    
Financing Receivable, Allowance for Credit Loss 28,115,000 $ 24,104,000 28,115,000 $ 24,104,000   24,230,000 $ 23,669,000 $ 24,336,000
Off-Balance-Sheet, Credit Loss, Liability 1,582,000   1,582,000          
Off-Balance-Sheet, Credit Loss, Liability 1,582,000   1,582,000          
Stockholders' Equity Attributable to Parent 272,632,000 $ 249,923,000 272,632,000 $ 249,923,000 $ 266,581,000 260,640,000 $ 245,051,000 $ 232,422,000
Net deferred tax asset 11,726,000   11,726,000     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           1,353,000    
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    
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 1,703,000   1,703,000          
Off-Balance-Sheet, Credit Loss, Liability 18,000   18,000          
Off-Balance-Sheet, Credit Loss, Liability 18,000   18,000          
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)