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Shareholders' Equity (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Before-Tax Amount |  |  |
Unrealized loss on available for sale securities | $ (31,235) | $ 16,051 | $ (22,907)
Reclassification adjustment for securities gains included in net income | (37) | (9,071) | (2,550)
Amortization of net unrealized losses on available for sale securities transferred to held to maturity | 2,694 |  |
Non-credit related unrealized loss on other-than-temporarily impaired debt securities | 285 | 285 | (285)
Amortization of unrealized loss on derivative financial instruments |  |  | 25
Unrecognized pension and postretirement income | 1,798 | (937) | (1,432)
Amortization of net unrecognized pension and postretirement income | 2,116 | 2,092 | 1,869
Total Other Comprehensive Loss | (24,379) | 8,420 | (25,280)
Tax Effect |  |  |
Unrealized loss on available for sale securities | 6,909 | (5,619) | 8,016
Reclassification adjustment for securities gains included in net income | 7 | 3,177 | 893
Amortization of net unrealized losses on available for sale securities transferred to held to maturity | (596) |  |
Non-credit related unrealized loss on other-than-temporarily impaired debt securities | (63) | (100) | 100
Amortization of unrealized loss on derivative financial instruments |  |  | (9)
Unrecognized pension and postretirement income | (398) | 328 | 501
Amortization of net unrecognized pension and postretirement income | (468) | (731) | (653)
Total Other Comprehensive Loss | 5,391 | (2,945) | 8,848
Net of Tax Amount |  |  |
Unrealized loss on available for sale securities | (24,326) | 10,432 | (14,891)
Reclassification adjustment for securities gains included in net income | (30) | (5,894) | (1,657)
Non-credit related unrealized loss on other-than-temporarily impaired debt securities | 222 | 185 | (185)
Amortization of net unrealized losses on available for sale securities transferred to held to maturity | 2,098 |  |
Amortization of unrealized loss on derivative financial instruments | 0 | 0 | 16
Unrecognized pension and postretirement income | 1,400 | (609) | (931)
Amortization of net unrecognized pension and postretirement income | 1,648 | 1,361 | 1,216
Total Other Comprehensive Loss | $ (18,988) | $ 5,475 | $ (16,432)

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4569643-111683 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e640-108580 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669646-108580 + Details
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Data Type: | xbrli:monetaryItemType
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Period Type: | duration