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Securities (Narrative) (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 USD ($) security | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) security | Sep. 30, 2016 USD ($) | Dec. 31, 2016 USD ($)
Number Of Securities Evaluated For Other Than Temporary Impairment [Line Items] |  |  |  |  |
Available-for-sale Securities | $ | $ 49,664 |  | $ 49,664 |  | $ 40,776
Securities evaluated for other than temporary impairment | security | 47 |  | 47 |  |
Available-for-sale Securities, Gross Realized Gains | $ | $ 51 | $ 209 | $ 113 | $ 437 |
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 | $ | $ 17,461 |  | $ 17,461 |  | 13,113
Securities evaluated for other than temporary impairment | security | 27 |  | 27 |  |
Municipals [Member] |  |  |  |  |
Number Of Securities Evaluated For Other Than Temporary Impairment [Line Items] |  |  |  |  |
Available-for-sale Securities | $ | $ 12,298 |  | $ 12,298 |  | 9,947
Securities evaluated for other than temporary impairment | security | 15 |  | 15 |  |
Corporates [Member] |  |  |  |  |
Number Of Securities Evaluated For Other Than Temporary Impairment [Line Items] |  |  |  |  |
Available-for-sale Securities | $ | $ 3,993 |  | $ 3,993 |  | $ 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 | 11 |  | 11 |  |
S&P Rated AA [Member] |  |  |  |  |
Number Of Securities Evaluated For Other Than Temporary Impairment [Line Items] |  |  |  |  |
Securities evaluated for other than temporary impairment | security | 33 |  | 33 |  |
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 |  |

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