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Consolidation Statements of Comprehensive Income - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Net income $ 165,861,000 $ 141,827,000 $ 106,418,000
Unrealized holding (losses) gains arising during year (26,143,000) 47,411,000 (54,557,000)
Non-credit portion of other-than-temporary impairments recognized in other comprehensive income 0 0 50,000
Amount reclassified into net income: Held-to-maturity securities (377,000) (844,000) (1,025,000)
Amount reclassified into net income: Non-credit other-than-temporary impairment 232,000 1,085,000 9,000
Realized gains on available for sale securities (9,110,000) (18,762,000) (15,301,000)
Total unrealized (losses) gains on investment securities (35,398,000) 28,890,000 (70,824,000)
Net actuarial gain (loss) 1,585,000 (35,189,000) 38,775,000
Amount reclassified into net income: Net actuarial loss 4,600,000 1,236,000 2,843,000
Amount reclassified into net income: Prior service cost 0 0 6,000
Amount reclassified into net income: Curtailment expense 0 0 11,000
Total defined benefit pension and post-retirement plans 6,185,000 (33,953,000) 41,635,000
Other comprehensive loss (29,213,000) (5,063,000) (29,189,000)
Comprehensive income $ 136,648,000 $ 136,764,000 $ 77,229,000