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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Statement of Comprehensive Income [Abstract] |  |  |  |
Net Income | $ 36,680 | $ 39,596 | $ 76,716 | $ 81,379
Other Comprehensive Income (Loss), net of tax: |  |  |  |
Unrealized gain (loss) on securities | (12,008) | 12,990 | (2,016) | 26,923
Reclassification adjustment for postretirement amendment gains included in net income | 0 | 0 | 0 | (944)
Reclassification adjustment for securities gains included in net income | (1,569) | (723) | (4,264) | (723)
Non-credit related unrealized gain on other-than-temporarily impaired debt securities | 0 | 323 | 125 | 512
Unrealized gain on derivative financial instruments | 34 | 34 | 68 | 68
Unrecognized postretirement income arising due to plan amendment | 0 | 0 | 0 | 2,144
Amortization of net unrecognized pension and postretirement items | 466 | 104 | 932 | 200
Other Comprehensive Income (Loss) | (13,077) | 12,728 | (5,155) | 28,180
Total Comprehensive Income | $ 23,603 | $ 52,324 | $ 71,561 | $ 109,559

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