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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 |  |

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