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Accumulated Other Comprehensive Loss (Schedule of Reclassifications From Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Mar. 31, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Tax (expense) benefit | $ (840) | $ (952) |  | $ (1,488) | $ (1,745) |
Net income | 3,016 | 2,310 | $ 2,310 | 5,522 | 4,289 | $ 5,269
Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Net income | (152) | (196) |  | (412) | (445) |
Investment securities- with OTTI [Member] |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Gain on calls of securities | 145 | 0 |  | 145 | 0 |
Interest income (expense) on investment securities: taxable | 52 | 55 |  | 107 | 57 |
Tax (expense) benefit | (53) | (22) |  | (68) | (23) |
Net income | 144 | 33 |  | 184 | 34 |
Investment Securities -All Other AFS [Member] |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Net gains/(losses) - other | (10) | (8) |  | (19) | (17) |
Tax (expense) benefit | 3 | 3 |  | 5 | 7 |
Net income | (7) | (5) |  | (14) | (10) |
Investment Securities HTM [Member] |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Interest income (expense) on investment securities: taxable | (52) | (71) |  | (114) | (172) |
Tax (expense) benefit | 14 | 28 |  | 31 | 68 |
Net income | (38) | (43) |  | (83) | (104) |
Pension Plan [Member] |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Tax (expense) benefit | 81 | 107 |  | 163 | 212 |
Net income | (221) | (160) |  | (441) | (322) |
Pension Plan [Member] | Amortization of unrecognized loss [Member] |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Salaries and employee benefits | (300) | (264) |  | (600) | (528) |
Pension Plan [Member] | Amortization of prior service costs [Member] |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Salaries and employee benefits | (2) | (3) |  | (4) | (6) |
SERP [Member] |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Tax (expense) benefit | 11 | 15 |  | 22 | 29 |
Net income | (30) | (21) |  | (58) | (43) |
SERP [Member] | Amortization of unrecognized loss [Member] |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Salaries and employee benefits | (41) | (36) |  | (81) | (73) |
SERP [Member] | Amortization of prior service costs [Member] |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Salaries and employee benefits | $ 0 | $ 0 |  | $ 1 | $ 1 |

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