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Accumulated Other Comprehensive Loss (Schedule of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2017
Beginning balance |  |  | $ (24,593) |  |
Balance | $ 112,974 | $ 111,134 | 108,390 | $ 120,838 | $ 113,698
Ending balance | (24,038) |  |  | (24,593) | (24,593)
Balance | 115,581 | 112,974 | 111,134 | 108,390 | 108,390
Investment securities- with OTTI [Member] |  |  |  |  |
Balance | (1,349) | (2,294) | (2,939) |  | (2,368)
Other comprehensive income/(loss) before reclassifications | 300 | 1,089 | 685 |  | 31
Reclassification of certain tax effect |  |  |  |  | (481)
Amounts reclassified from accumulated other comprehensive income (loss) | (39) | (144) | (40) |  | (121)
Balance | (1,088) | (1,349) | (2,294) | (2,939) | (2,939)
Investment Securities -All Other AFS [Member] |  |  |  |  |
Balance | (4,287) | (4,057) | (2,979) |  | (3,218)
Other comprehensive income/(loss) before reclassifications | (672) | (237) | (1,085) |  | 638
Reclassification of certain tax effect |  |  |  |  | (435)
Amounts reclassified from accumulated other comprehensive income (loss) | 7 | 7 | 7 |  | 36
Balance | (4,952) | (4,287) | (4,057) | (2,979) | (2,979)
Investment Securities HTM [Member] |  |  |  |  |
Balance | (1,264) | (1,302) | (1,347) |  | (1,354)
Other comprehensive income/(loss) before reclassifications | 0 | 0 | 0 |  | 0
Reclassification of certain tax effect |  |  |  |  | (246)
Amounts reclassified from accumulated other comprehensive income (loss) | 63 | 38 | 45 |  | 253
Balance | (1,201) | (1,264) | (1,302) | (1,347) | (1,347)
Cash Flow Hedge (OCI) [Member] |  |  |  |  |
Balance | 1,133 | 1,025 | 582 |  | 422
Other comprehensive income/(loss) before reclassifications | 112 | 108 | 443 |  | 59
Reclassification of certain tax effect |  |  |  |  | 101
Amounts reclassified from accumulated other comprehensive income (loss) | 0 | 0 | 0 |  | 0
Balance | 1,245 | 1,133 | 1,025 | 582 | 582
Pension Plan [Member] |  |  |  |  |
Balance | (17,860) | (16,330) | (17,066) |  | (14,232)
Other comprehensive income/(loss) before reclassifications | 355 | (1,750) | 516 |  | (445)
Reclassification of certain tax effect |  |  |  |  | (3,170)
Amounts reclassified from accumulated other comprehensive income (loss) | 220 | 220 | 220 |  | 781
Balance | (17,285) | (17,860) | (16,330) | (17,066) | (17,066)
SERP [Member] |  |  |  |  |
Balance | (786) | (815) | (844) |  | (715)
Other comprehensive income/(loss) before reclassifications | 0 | 0 | 0 |  | (82)
Reclassification of certain tax effect |  |  |  |  | (152)
Amounts reclassified from accumulated other comprehensive income (loss) | 29 | 29 | 29 |  | 105
Balance | (757) | (786) | (815) | (844) | (844)
Accumulated Other Comprehensive Loss [Member] |  |  |  |  |
Balance | (24,413) | (23,773) | (24,593) | (18,965) | (21,465)
Other comprehensive income/(loss) before reclassifications | 95 | (790) | 559 |  | 201
Reclassification of certain tax effect |  |  |  | (4,383) | (4,383)
Amounts reclassified from accumulated other comprehensive income (loss) | 280 | 150 | 261 |  | 1,054
Balance | $ (24,038) | $ (24,413) | $ (23,773) | $ (24,593) | $ (24,593)

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- Definition Amount of increase (decrease) in accumulated other comprehensive income (AOCI) for reclassification to retained earnings of tax effect from remeasurement of deferred tax liability and asset pursuant to Tax Cuts and Jobs Act of 2017. + References No definition available. + Details
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