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Accumulated Other Comprehensive Income Changes in Other Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Equity [Abstract] |  |
Unrealized gain on securities, before tax amount | $ 6,575 | $ 26,193
Unrealized gain on securities, tax effect | (2,302) | (9,167)
Unrealized gain on securities, net of tax amount | 4,273 | 17,026
Reclassification adjustment for securities gains included in net income, before tax amount | (1,106) | (947)
Reclassification adjustment for securities gains included in net income, tax effect | 387 | 331
Reclassification adjustment for securities gains included in net income, net of tax amount | (719) | (616)
Amortization of unrealized loss on derivative financial instruments, before tax amount |  | 6
Amortization of unrealized loss on derivative financial instruments, tax effect |  | (2)
Amortization of unrealized loss on derivative financial instruments, net of tax amount | 0 | 4
Amortization of net unrecognized pension and postretirement items, before tax amount | 528 | 717
Amortization of net unrecognized pension and postretirement items, tax effect | (185) | (251)
Amortization of net unrecognized pension and postretirement items, net of tax amount | 343 | 466
Total Other Comprehensive Income, Before Tax Amount | 5,997 | 25,969
Total Other Comprehensive Income, Tax Effect | (2,100) | (9,089)
Other Comprehensive Income | $ 3,897 | $ 16,880

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- Definition Amount before tax of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) related to pension and other postretirement benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669646-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 4: 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 + Details
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