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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Consolidated Statements of Comprehensive Income (Unaudited) [Abstract] |  |  |  |
Net income per consolidated statements of income | $ 30,602 | $ 32,897 | $ 59,750 | $ 61,900
Unrealized (losses) gains on available for sale securities and transferred securities: |  |  |  |
Unrealized holding (losses) gains arising during the period | (13,951) | 6,767 | (2,565) | 10,996
Less: adjustment for net gains realized in net income | 0 | 0 | 0 | (240)
Change in net unrealized holding losses on securities transferred to held to maturity | 1,021 | 910 | 1,895 | 1,733
Pension and other postretirement benefit plans: |  |  |  |
Net change in prior service costs | 38 | 38 | 77 | 77
Recognized net loss due to lump sum settlement | 296 | 231 | 553 | 463
Change in net actuarial loss | 751 | 556 | 1,505 | 1,115
Derivatives: |  |  |  |
Change in the accumulated loss on effective cash flow hedge derivatives | 174 | (562) | (434) | (970)
Less: adjustment for loss realized in net income | 130 | 0 | 260 | 0
Other comprehensive (loss) income, net of tax | (11,541) | 7,940 | 1,291 | 13,174
Comprehensive income | $ 19,061 | $ 40,837 | $ 61,041 | $ 75,074

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