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CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Statement [Abstract]      
Accumulated other comprehensive income $ 566 $ 604 $ 142
Accumulated other comprehensive income reclassification for prior service credit on the postretirement plan 0 1,278 315
Income tax expense from reclassification items 198 147 160
Unrealized gains (losses) on securities available for sale, net of reclassifications, tax 1,093 (344) 444
Accretion of unrealized losses on securities transferred from available for sale to held to maturity, tax 66 86 21
Unrealized gains (losses) and amortization of prior service credit on postretirement plan, tax $ 0 $ (447) $ (46)