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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Consolidated Statements of Comprehensive Income      
Net income $ 3,414 $ 7,282 $ 8,599
Securities available for sale:      
Unrealized loss on investment securities available-for-sale, net of tax (23) (972) (800)
Adjustment for gain on sales of investment securities, net of tax (3) (373) (5)
Defined benefit pension plans:      
Net (loss) gain arising during the year, net of tax (673) (487) 3
Amortization of prior service cost included in net periodic pension cost, net of tax 56 49 12
Total other comprehensive loss (643) (1,783) (790)
Total comprehensive income $ 2,771 $ 5,494 $ 7,809