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Accumulated Other Comprehensive Income Changes in Other Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Equity [Abstract] |  |  |  |
Unrealized gain on securities, before tax amount | $ 19,753 | $ (18,474) | $ 45,946 | $ (3,103)
Unrealized gain on securities, tax effect | (6,914) | 6,466 | (16,081) | 1,087
Unrealized gain on securities, net of tax amount | 12,839 | (12,008) | 29,865 | (2,016)
Reclassification adjustment for securities gains included in net income, before tax amount | (76) | (2,413) | (1,023) | (6,558)
Reclassification adjustment for securities gains included in net income, tax effect | 27 | 844 | 358 | 2,294
Reclassification adjustment for securities gains included in net income, net of tax amount | (49) | (1,569) | (665) | (4,264)
Non-credit related unrealized gains on other-than-temporarily impaired debt securities, before tax amount |  |  |  | 192
Non-credit related unrealized gains on other-than-temporarily impaired debt securities, tax effect |  |  |  | (67)
Non-credit related unrealized gains on other-than-temporarily impaired debt securities, net of tax amount | 0 | 0 | 0 | 125
Amortization of unrealized loss on derivative financial instruments, before tax amount | 6 | 52 | 12 | 104
Amortization of unrealized loss on derivative financial instruments, tax effect | (2) | (18) | (4) | (36)
Amortization of unrealized loss on derivative financial instruments, net of tax amount | 4 | 34 | 8 | 68
Amortization of net unrecognized pension and postretirement items, before tax amount | 49 | 717 | 766 | 1,434
Amortization of net unrecognized pension and postretirement items, tax effect | (17) | (251) | (268) | (502)
Amortization of net unrecognized pension and postretirement items, net of tax amount | 32 | 466 | 498 | 932
Total Other Comprehensive Income, Before Tax Amount | 19,732 | (20,118) | 45,701 | (7,931)
Total Other Comprehensive Income, Tax Effect | (6,906) | 7,041 | (15,995) | 2,776
Other Comprehensive Income (Loss) | $ 12,826 | $ (13,077) | $ 29,706 | $ (5,155)

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