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Shareholders' Equity (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Before-Tax Amount |  |  |
Unrealized gain on securities | $ 16,051 | $ (22,907) | $ (11,872)
Reclassification adjustment for securities gains included in net income (1) | (9,071) | (2,550) | (9,066)
Reclassification adjustment for loss on derivative financial instruments included in net income (2) |  |  | 3,778
Non-credit related unrealized loss on other-than-temporarily impaired debt securities | 285 | (285) | 368
Amortization of unrealized loss on derivative financial instruments (2) |  | 25 | 115
Unrecognized pension and postretirement cost | (937) | (1,432) | 7,200
Amortization of net unrecognized pension and postretirement income (2) | 2,092 | 1,869 | 2,869
Total Other Comprehensive Income | 8,420 | (25,280) | (6,608)
Tax Effect |  |  |
Unrealized gain on securities | (5,619) | 8,016 | 4,155
Reclassification adjustment for securities gains included in net income (1) | 3,177 | 893 | 3,174
Reclassification adjustment for loss on derivative financial instruments included in net income (2) |  |  | (1,322)
Non-credit related unrealized loss on other-than-temporarily impaired debt securities | (100) | 100 | (129)
Amortization of unrealized loss on derivative financial instruments (2) |  | (9) | (40)
Unrecognized pension and postretirement cost | 328 | 501 | (2,520)
Amortization of net unrecognized pension and postretirement income (2) | (731) | (653) | (1,005)
Total Other Comprehensive Income | (2,945) | 8,848 | 2,313
Net of Tax Amount |  |  |
Unrealized gain on securities | 10,432 | (14,891) | (7,717)
Reclassification adjustment for securities gains included in net income (1) | (5,894) | (1,657) | (5,892)
Reclassification adjustment for loss on derivative financial instruments included in net income (2) | 0 | 0 | 2,456
Non-credit related unrealized loss on other-than-temporarily impaired debt securities | 185 | (185) | 239
Amortization of unrealized loss on derivative financial instruments (2) | 0 | 16 | 75
Unrecognized pension and postretirement cost | (609) | (931) | 4,680
Amortization of net unrecognized pension and postretirement income (2) | 1,361 | 1,216 | 1,864
Total Other Comprehensive Income | $ 5,475 | $ (16,432) | $ (4,295)

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- Definition Amount of tax (expense) benefit of other than temporary impairment loss (OTTI) on investments in available-for-sale and held-to-maturity debt securities, recognized in other comprehensive loss and attributable to parent entity. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4569643-111683 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e640-108580 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration