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CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Income Statement [Abstract]    
Accumulated other comprehensive income $ 153 $ 11
Accumulated other comprehensive income reclassification from prior service credit on postretirement plan (278) 0
Income tax expense from reclassification items 151 4
Unrealized gains on securities available for sale, net of reclassifications, tax 3,460 2,094
Accretion of unrealized losses on securities transferred from available for sale to held to maturity, tax 18 0
Accretion of unrecognized actuarial gains and amortization of prior service credit on postretirement plan, tax $ (97) $ 0