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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Net income $ 43,601 $ 33,768 $ 80,633 $ 73,476
Unrealized holding gains (losses) arising during period 36,188 (39,160) 78,917 (23,574)
Non-credit portion of other-than-temporary impairments recognized in other comprehensive income (6) 0 (6) 0
Non-credit portion of other-than-temporary impairments recognized in other comprehensive income 0 0 0 232
Amount reclassified into net income: Held-to-maturity securities (12) (120) (59) (290)
Amount reclassified into net income: Realized (gains) losses on available-for-sale securities (1,145) 2,225 609 (10,707)
Total unrealized gains (losses) on investment securities 35,025 (37,055) 79,461 (34,339)
Amount reclassified into net income: Net actuarial loss 985 1,111 1,971 2,222
Total defined benefit pension and post-retirement plans 985 1,111 1,971 2,222
Other comprehensive income (loss) 36,010 (35,944) 81,432 (32,117)
Comprehensive income (loss) $ 79,611 $ (2,176) $ 162,065 $ 41,359