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Consolidated Statements of Comprehensive Income (unaudited) (Parenthetical) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Other comprehensive (loss) income, net of tax:        
Unrealized net holding gains (losses) arising during the period, pre-tax amounts $ 3,801 $ (3,693) $ 3,367 $ 13,199
Reclassification adjustment for net gains related to securities available for sale included in net income, pre-tax amounts 3 38 43 59
Amortization of unrealized net gains and losses related to the reclassification of available for sale investment securities to held to maturity, pre-tax amounts 328 (99) 999 (99)
Amortization of prior service cost and actuarial gains, pre-tax amounts $ 551 $ 19 $ 1,673 $ 57