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Supplemental Comprehensive Income Disclosures Supplemental Comprehensive Income Disclosures (Details 2) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Accumulated Other Comprehensive Income [Line Items] |  |  |
Balance at beginning of period | $ (7,027) | $ (2,386) | $ (4,499)
Other comprehensive income before reclassification adjustment | 3,979 | (4,409) | 2,112
Amounts reclassified from accumulated other comprehensive income (loss) | (3,199) | (447) | 67
Net gain | 74 | 215 | (66)
Net other comprehensive income during the period | 854 | (4,641) | 2,113
Balance at end of period | (6,173) | (7,027) | (2,386)
Securities Available for Sale |  |  |
Accumulated Other Comprehensive Income [Line Items] |  |  |
Balance at beginning of period | (7,455) | (2,956) | (4,875)
Other comprehensive income before reclassification adjustment | 4,565 | (4,098) | 1,820
Amounts reclassified from accumulated other comprehensive income (loss) | (3,276) | (401) | 99
Net other comprehensive income during the period | 1,289 | (4,499) | 1,919
Balance at end of period | (6,166) | (7,455) | (2,956)
Derivatives |  |  |
Accumulated Other Comprehensive Income [Line Items] |  |  |
Balance at beginning of period | 203 | 560 | 300
Other comprehensive income before reclassification adjustment | (586) | (311) | 292
Amounts reclassified from accumulated other comprehensive income (loss) | 77 | (46) | (32)
Net other comprehensive income during the period | (509) | (357) | 260
Balance at end of period | (306) | 203 | 560
Post-Retirement Obligation |  |  |
Accumulated Other Comprehensive Income [Line Items] |  |  |
Balance at beginning of period | 225 | 10 | 76
Net gain | 74 | 215 | (66)
Net other comprehensive income during the period | 74 | 215 | (66)
Balance at end of period | $ 299 | $ 225 | $ 10

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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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- Definition Amount, after tax and reclassification adjustment, of (increase) decrease in accumulated other comprehensive income for defined benefit plan, attributable to parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4569616-111683 Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=84161450&loc=SL4573702-111684 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i-k) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 + Details
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