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Stockholders' Equity (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Unrealized Gain (Loss) on Securities |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |
Balance at beginning of period | [1] |  |  | $ (591) | $ 214
Other comprehensive income (loss), before reclassifications | [1] |  |  | 2,884 | 1,012
Amounts reclassified from accumulated other comprehensive income (loss) | [1] |  |  | (602) | (8)
Current period other comprehensive income, before tax | [1] |  |  | 2,282 | 1,004
Income tax expense | [1] |  |  | (867) | (382)
Current period other comprehensive income, net of tax | [1] |  |  | 1,415 | 622
Balance at end of period | [1] | $ 824 | $ 836 | 824 | 836
Unrecognized Net Pension and Postretirement Costs |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |
Balance at beginning of period | [2] |  |  | (1,427) | (1,442)
Other comprehensive income (loss), before reclassifications | [2] |  |  | 59 | 108
Amounts reclassified from accumulated other comprehensive income (loss) | [2] |  |  | 0 | 0
Current period other comprehensive income, before tax | [2] |  |  | 59 | 108
Income tax expense | [2] |  |  | (23) | (40)
Current period other comprehensive income, net of tax | [2] |  |  | 36 | 68
Balance at end of period | [2] | (1,391) | (1,374) | (1,391) | (1,374)
Accumulated Other Comprehensive (Loss) Income |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |
Balance at beginning of period |  |  |  | (2,018) | (1,228)
Other comprehensive income (loss), before reclassifications |  |  |  | 2,943 | 1,120
Amounts reclassified from accumulated other comprehensive income (loss) |  |  |  | (602) | (8)
Current period other comprehensive income, before tax |  |  |  | 2,341 | 1,112
Income tax expense |  |  |  | (890) | (422)
Current period other comprehensive income, net of tax |  |  |  | 1,451 | 690
Balance at end of period |  | (567) | (538) | (567) | (538)
Balance at beginning of period |  |  |  | (2,018) |
Current period other comprehensive income, net of tax |  | (351) | $ 1,017 | 1,451 | $ 690
Balance at end of period |  | $ (567) |  | $ (567) |
[1] | The pre-tax amounts reclassified from accumulated other comprehensive income (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 income (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://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=66004124&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=66004124&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=66004124&loc=SL7669686-108580 + Details
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- Definition Amount before tax and reclassification adjustments of other comprehensive income (loss). + References Reference 1: 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=66004124&loc=SL7669686-108580 + Details
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- Definition Amount before tax, after reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669625-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66022249&loc=d3e33775-111570 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669619-108580 + Details
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