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Securities (Narrative) (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2017
USD ($)
security
Mar. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
Number Of Securities Evaluated For Other Than Temporary Impairment [Line Items]      
Available-for-sale Securities | $ $ 48,220   $ 40,776
Securities evaluated for other than temporary impairment | security 46    
Available-for-sale Securities, Gross Realized Gains | $ $ 10 $ 65  
Available-for-sale Securities, Gross Realized Losses | $ 0 $ 0  
US Treasuries [Member]      
Number Of Securities Evaluated For Other Than Temporary Impairment [Line Items]      
Available-for-sale Securities | $ 1,849   1,833
US Agency Obligations [Member]      
Number Of Securities Evaluated For Other Than Temporary Impairment [Line Items]      
Available-for-sale Securities | $ $ 13,302   13,113
Securities evaluated for other than temporary impairment | security 23    
Municipals [Member]      
Number Of Securities Evaluated For Other Than Temporary Impairment [Line Items]      
Available-for-sale Securities | $ $ 12,598   9,947
Securities evaluated for other than temporary impairment | security 16    
Corporates [Member]      
Number Of Securities Evaluated For Other Than Temporary Impairment [Line Items]      
Available-for-sale Securities | $ $ 4,937   $ 3,878
Securities evaluated for other than temporary impairment | security 7    
S&P Rated AAA [Member]      
Number Of Securities Evaluated For Other Than Temporary Impairment [Line Items]      
Securities evaluated for other than temporary impairment | security 9    
S&P Rated AA [Member]      
Number Of Securities Evaluated For Other Than Temporary Impairment [Line Items]      
Securities evaluated for other than temporary impairment | security 32    
S&P Rated A [Member]      
Number Of Securities Evaluated For Other Than Temporary Impairment [Line Items]      
Securities evaluated for other than temporary impairment | security 5