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Consolidated Statements of Comprehensive Income (unaudited) (Parenthetical) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Other comprehensive income (loss), net of tax:        
Unrealized net holding gains (losses) arising during the period, pre-tax amounts $ (2,931) $ 3,801 $ 14,009 $ 3,367
Reclassification adjustment for net gains related to securities available for sale included in net income, pre-tax amounts 0 3 30 43
Unrealized losses on derivatives (cash flow hedges), pre-tax amounts 782 0 719 0
Amortization of unrealized net gains and losses related to the reclassification of available for sale investment securities to held to maturity, pre-tax amounts 267 328 843 999
Amortization of prior service cost and actuarial gains, pre-tax amounts $ 519 $ 551 $ 1,544 $ 1,673