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Investment Securities (Narrative) (Details)
 3 Months Ended
Mar. 31, 2020
USD ($)
Security
Dec. 31, 2019
USD ($)
Security
Schedule Of Investments [Line Items]    
Securities pledged as collateral $ 660,100,000 $ 676,900,000
Number of security positions, unrealized loss position | Security 6 91
Number of security positions, unrealized loss position for more than 12 months | Security 1 34
Securities, 12 months or longer, Fair Value $ 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 5 57
Securities, less than 12 months, Fair Value $ 19,752,000 $ 178,723,000
Securities, less than 12 months, Unrealized Losses 466,000 1,595,000
Available for sale securities, allowance for credit loss 0  
Debt securities, held-to-maturity 346,252,000 359,000,000
Investment securities, past due 19,930,000 7,081,000
Investment securities, nonaccrual 12,382,000 8,634,000
Municipal Bonds [Member]    
Schedule Of Investments [Line Items]    
Debt securities, held-to-maturity 180,000,000  
Internally rated held-to-maturity securities 7,100,000  
Municipal Bonds [Member] | Below Investment Grade [Member]    
Schedule Of Investments [Line Items]    
Investment grade rating exposure $ 278,000  
Investment grade rating exposure percentage 0.15%  
Maximum [Member]    
Schedule Of Investments [Line Items]    
Securities, 12 months or longer, Unrealized Losses $ 1,000  
Available for Sale Securities [Member]    
Schedule Of Investments [Line Items]    
Accrued interest receivable 1,000,000 1,000,000
Held To Maturity Investment Securities [Member]    
Schedule Of Investments [Line Items]    
Accrued interest receivable 1,700,000 $ 1,200,000
Investment securities, past due 0  
Investment securities, nonaccrual $ 0