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Stockholders' Equity (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |
Balance at beginning of period |  |  |  | $ (5,662) |
Current period other comprehensive (loss) income, net of tax |  | $ (892) | $ 99 | (2,964) | $ 1,026
Balance at end of period |  | (8,626) |  | (8,626) |
Unrealized Gain (Loss) on Securities |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |
Balance at beginning of period | [1] |  |  | (2,500) | (1,936)
Other comprehensive (loss) income, before reclassifications | [1] |  |  | (3,915) | 1,588
Amounts reclassified from accumulated other comprehensive (loss) income | [1] |  |  | 0 | 0
Current period other comprehensive (loss) income, before tax | [1] |  |  | (3,915) | 1,588
Income tax expense (benefit) | [1] |  |  | 822 | (604)
Current period other comprehensive (loss) income, net of tax | [1] |  |  | (3,093) | 984
Balance at end of period | [1] | (5,593) | (952) | (5,593) | (952)
Unrecognized Net Pension and Postretirement Costs |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |
Balance at beginning of period | [2] |  |  | (3,162) | (1,865)
Other comprehensive (loss) income, before reclassifications | [2] |  |  | 164 | 67
Amounts reclassified from accumulated other comprehensive (loss) income | [2] |  |  | 0 | 0
Current period other comprehensive (loss) income, before tax | [2] |  |  | 164 | 67
Income tax expense (benefit) | [2] |  |  | (35) | (25)
Current period other comprehensive (loss) income, net of tax | [2] |  |  | 129 | 42
Balance at end of period | [2] | (3,033) | (1,823) | (3,033) | (1,823)
Accumulated Other Comprehensive (Loss) Income |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |
Balance at beginning of period |  |  |  | (5,662) | (3,801)
Other comprehensive (loss) income, before reclassifications |  |  |  | (3,751) | 1,655
Amounts reclassified from accumulated other comprehensive (loss) income |  |  |  | 0 | 0
Current period other comprehensive (loss) income, before tax |  |  |  | (3,751) | 1,655
Income tax expense (benefit) |  |  |  | 787 | (629)
Current period other comprehensive (loss) income, net of tax |  |  |  | (2,964) | 1,026
Balance at end of period |  | $ (8,626) | $ (2,775) | $ (8,626) | $ (2,775)
[1] | The pre-tax amounts reclassified from accumulated other comprehensive loss are included in gain on sale of investment securities in the consolidated statements of income.
[2] | The pre-tax amounts reclassified from accumulated other comprehensive loss are included in the computation of net periodic pension cost.

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e637-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e681-108580 + Details
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