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Securities (Narrative) (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2020
USD ($)
security
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Number Of Securities Evaluated For Other Than Temporary Impairment [Line Items]      
Securities evaluated for other than temporary impairment 5    
Available-for-sale Securities, Gross Realized Gains | $ $ 431,000 $ 0  
Available-for-sale Securities, Gross Realized Losses | $ 0 0  
Held-to-maturity securities sales | $ 0 $ 0  
Available-for-sale Securities | $ $ 54,992   $ 59,655
US Agency Obligations [Member]      
Number Of Securities Evaluated For Other Than Temporary Impairment [Line Items]      
Securities evaluated for other than temporary impairment 2    
Available-for-sale Securities | $ $ 27,269   32,108
Corporates [Member]      
Number Of Securities Evaluated For Other Than Temporary Impairment [Line Items]      
Securities evaluated for other than temporary impairment 3    
Available-for-sale Securities | $ $ 3,972   $ 4,097
S&P Rated AAA [Member]      
Number Of Securities Evaluated For Other Than Temporary Impairment [Line Items]      
Securities evaluated for other than temporary impairment 2    
S&P Rated AA [Member]      
Number Of Securities Evaluated For Other Than Temporary Impairment [Line Items]      
Securities evaluated for other than temporary impairment 1    
S&P Rated A [Member]      
Number Of Securities Evaluated For Other Than Temporary Impairment [Line Items]      
Securities evaluated for other than temporary impairment 1    
S&P Rated BBB+ [Member]      
Number Of Securities Evaluated For Other Than Temporary Impairment [Line Items]      
Securities evaluated for other than temporary impairment 1