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CONDENSED CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Income Statement [Abstract]        
Accumulated other comprehensive income $ 301 $ 233 $ 330 $ 386
Accumulated other comprehensive income reclassification from prior service credit on postretirement plan 0 (278) 0 (556)
Income tax expense from reclassification items 105 178 115 329
Unrealized gain on securities available for sale, net of reclassifications, tax 842 2,392 1,362 5,852
Accretion of unrealized losses on securities transferred from available for sale to held to maturity, tax 17 20 35 38
Accretion of unrecognized actuarial gains and amortization of prior service credit on postretirement plan, tax $ 0 $ (97) $ 0 $ (194)