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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Net income $ 50,440 $ 37,032
Unrealized holding gains arising during period 16,761 42,729
Amounts reclassified into net income: Held-to-maturity securities (32) (47)
Amounts reclassified into net income: Realized losses on available-for-sale securities 981 1,754
Total unrealized gains on investment securities 17,710 44,436
Amount reclassified into net income: Net actuarial loss 330 986
Total defined benefit pension and post-retirement plans 330 986
Other comprehensive income 18,040 45,422
Comprehensive income $ 68,480 $ 82,454