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Securities (Narrative) (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
security
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
security
Jun. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Number Of Securities Evaluated For Other Than Temporary Impairment [Line Items]          
Available-for-sale Securities | $ $ 49,315   $ 49,315   $ 40,776
Securities evaluated for other than temporary impairment | security 43   43    
Available-for-sale Securities, Gross Realized Gains | $ $ 52 $ 163 $ 62 $ 228  
Available-for-sale Securities, Gross Realized Losses | $ 0 $ 0 0 $ 0  
US Treasuries [Member]          
Number Of Securities Evaluated For Other Than Temporary Impairment [Line Items]          
Available-for-sale Securities | $ 1,874   1,874   1,833
US Agency Obligations [Member]          
Number Of Securities Evaluated For Other Than Temporary Impairment [Line Items]          
Available-for-sale Securities | $ $ 13,556   $ 13,556   13,113
Securities evaluated for other than temporary impairment | security 24   24    
Municipals [Member]          
Number Of Securities Evaluated For Other Than Temporary Impairment [Line Items]          
Available-for-sale Securities | $ $ 13,046   $ 13,046   9,947
Securities evaluated for other than temporary impairment | security 14   14    
Corporates [Member]          
Number Of Securities Evaluated For Other Than Temporary Impairment [Line Items]          
Available-for-sale Securities | $ $ 3,991   $ 3,991   $ 3,878
Securities evaluated for other than temporary impairment | security 5   5    
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   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 31   31    
S&P Rated A [Member]          
Number Of Securities Evaluated For Other Than Temporary Impairment [Line Items]          
Securities evaluated for other than temporary impairment | security 3   3