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Consolidation Statements of Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Net income $ 37,032 $ 39,708
Unrealized holding gains arising during period 42,729 15,586
Amount reclassified into net income: Held-to-maturity securities (47) (170)
Amount reclassified into net income: Non-credit other-than-temporary impairments 0 232
Amount reclassified into net income: Realized losses (gains) on available-for-sale securities 1,754 (12,932)
Total unrealized gains on investment securities 44,436 2,716
Amount reclassified into net income: Net actuarial loss 986 1,111
Total defined benefit pension and post-retirement plans 986 1,111
Other comprehensive income 45,422 3,827
Comprehensive income $ 82,454 $ 43,535