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Comprehensive Income/Loss (Comprised of the following Components) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Prior Period Reclassification Adjustment | [1] |  |  |  |  | $ 0 |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  | $ 0 | [2] | $ 177 | [3] | 0 | [2] | $ 177 | [3]
Beginning Balance |  |  |  |  |  | (1,831) |  | (1,337) |
Net change in other comprehensive income (loss) |  | (1,919) |  | 680 |  | (7,055) |  | 1,378 |
Ending Balance |  | (10,114) |  | 41 |  | (10,114) |  | 41 |
Unrealized Gain on Securities |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Prior Period Reclassification Adjustment |  |  |  |  |  | (111) |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  | (831) |  |  |  | (831) |  |  |
Beginning Balance |  |  |  |  |  | (504) |  | 173 |
Net change in other comprehensive income (loss) |  |  |  |  |  | (7,392) |  | 1,323 |
Ending Balance |  | (8,838) |  | 1,496 |  | (8,838) |  | 1,496 |
Unrealized Gain (Loss) on Cash Flow Hedge |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Prior Period Reclassification Adjustment |  |  |  |  |  | 205 |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  | 0 |  |  |  | 0 |  |  |
Beginning Balance |  |  |  |  |  | 948 |  | 361 |
Net change in other comprehensive income (loss) |  |  |  |  |  | 191 |  | (29) |
Ending Balance |  | 1,344 |  | 332 |  | 1,344 |  | 332 |
Deferred Gain on Hedge Transactions |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Prior Period Reclassification Adjustment |  |  |  |  |  | 29 |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  | 0 |  |  |  | 0 |  |  |
Beginning Balance |  |  |  |  |  | 137 |  | 281 |
Net change in other comprehensive income (loss) |  |  |  |  |  | (88) |  | (72) |
Ending Balance |  | 78 |  | 209 |  | 78 |  | 209 |
Defined Benefit Postretirement Plans |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Prior Period Reclassification Adjustment |  |  |  |  |  | (520) |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  | 0 |  |  |  | 0 |  |  |
Beginning Balance |  |  |  |  |  | (2,412) |  | (2,152) |
Net change in other comprehensive income (loss) |  |  |  |  |  | 234 |  | 156 |
Ending Balance |  | (2,698) |  | $ (1,996) |  | (2,698) |  | (1,996) |
AOCI Attributable to Parent [Member] |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Prior Period Reclassification Adjustment | [2] |  |  |  |  | (397) |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets | [1] | $ (831) |  |  |  | (831) |  |  |
Net change in other comprehensive income (loss) |  |  |  |  |  | $ (7,055) |  | $ 1,378 |
[1] | Represents adjustment needed to reflect the cumulative impact on retained earnings for the classification and measurement of investments in equity securities. Pursuant to the Company's adoption of Accounting Standards Update 2016-01, the Company's investments in equity securities will no longer be classified as available for sale, therefore the Company was required to reclassify the net unrealized gain recognized on the change in fair value of these equity securities from other comprehensive income to retained earnings.
[2] | Represents adjustment needed to reflect the cumulative impact on retained earnings for reclassification of the income tax effects attributable to accumulated other comprehensive income, as a result of the Tax Cuts and Jobs Act (the "Tax Act"). Pursuant to the Company's adoption of Accounting Standards Update 2018-02, the Company has elected to reclassify amounts stranded in other comprehensive income to retained earnings.
[3] | Represents adjustment needed to reflect the cumulative impact on retained earnings for previously recognized stock based compensation, which included an adjustment for estimated forfeitures. Pursuant to the Company's adoption of Accounting Standards Update 2016-09, the Company has elected to recognize stock based compensation without inclusion of a forfeiture estimate, and as such has recognized this adjustment to present retained earnings consistent with this election.

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e681-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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