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CONDENSED CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Income Statement [Abstract]    
Accumulated other comprehensive income $ 29 $ 153
Accumulated other comprehensive income reclassification from prior service credit on postretirement plan 0 (278)
Income tax expense from reclassification items 10 151
Unrealized gain on securities available for sale, net of reclassifications, tax 520 3,460
Accretion of unrealized losses on securities transferred from available for sale to held to maturity, tax 18 18
Accretion of unrecognized actuarial gains and amortization of prior service credit on postretirement plan, tax $ 0 $ (97)