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Investment Securities (Narrative) (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
Security
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Security
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Security
Schedule Of Investments [Line Items]          
Securities pledged as collateral $ 634,400,000   $ 634,400,000   $ 676,900,000
Number of security positions, unrealized loss position | Security 16   16   91
Number of security positions, unrealized loss position for more than 12 months | Security 1   1   34
Securities, 12 months or longer, Fair Value $ 8,000   $ 8,000   $ 47,202,000
Securities, 12 months or longer, Unrealized Losses         $ 659,000
Number of security positions, unrealized loss position for less than 12 months | Security 15   15   57
Securities, less than 12 months, Fair Value $ 83,178,000   $ 83,178,000   $ 178,723,000
Securities, less than 12 months, Unrealized Losses 206,000   206,000   1,595,000
Available for sale securities, allowance for credit loss 0   0    
Debt securities, held-to-maturity 290,954,000   290,954,000   359,000,000
Investment securities, past due 5,226,000   5,226,000   7,081,000
Investment securities, nonaccrual 10,762,000   10,762,000   8,634,000
Municipal Bonds [Member]          
Schedule Of Investments [Line Items]          
Debt securities, held-to-maturity 151,600,000   151,600,000    
Internally rated held-to-maturity securities 8,500,000   8,500,000    
Municipal Bonds [Member] | Below Investment Grade [Member]          
Schedule Of Investments [Line Items]          
Investment grade rating exposure 279,000   $ 279,000    
Investment grade rating exposure percentage     0.18%    
Maximum [Member]          
Schedule Of Investments [Line Items]          
Securities, 12 months or longer, Unrealized Losses 1,000   $ 1,000    
Available for Sale Securities [Member]          
Schedule Of Investments [Line Items]          
Accrued interest receivable 1,000,000.0   1,000,000.0   1,000,000.0
Held To Maturity Investment Securities [Member]          
Schedule Of Investments [Line Items]          
Accrued interest receivable 1,400,000   1,400,000   $ 1,200,000
Credit loss expense 0 $ 0 (6,000) $ 0  
Investment securities, past due 0   0    
Investment securities, nonaccrual $ 0   $ 0