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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Statement of Comprehensive Income [Abstract] |  |  |  |
Net income | $ 75,850 | $ 77,381 | $ 221,090 | $ 205,273
Other comprehensive income (loss), before tax: |  |  |  |
Change in net unrealized gain/loss on securities available for sale during the period | 86,445 | 9,464 | 7,704 | 76,007
Change in net unrealized gain on securities transferred to held to maturity | (8,831) | (8,746) | (24,925) | (27,119)
Reclassification adjustment for net (gains) losses included in net income | 52 | (33) | (176) | (35)
Total securities available for sale and transferred securities, Before Tax Amount | 77,666 | 685 | (17,397) | 48,853
Defined-benefit post-retirement benefit plans: |  |  |  |
Change in the net actuarial gain/loss | 1,748 | 672 | 5,246 | 2,015
Derivatives: |  |  |  |
Reclassification adjustment for gains on interest rate swaps on variable-rate loans included in net income | 0 | (9,345) | 0 | (28,035)
Total other comprehensive income (loss), before tax | 79,414 | (7,988) | (12,151) | 22,833
Deferred tax expense (benefit) related to other comprehensive income | 27,795 | (2,796) | (4,253) | 7,991
Other comprehensive income (loss), net of tax | 51,619 | (5,192) | (7,898) | 14,842
Comprehensive income (loss) | $ 127,469 | $ 72,189 | $ 213,192 | $ 220,115

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