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Comprehensive Income - Components of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Comprehensive Income    
Net unrealized gain on investment securities available-for-sale $ 553 $ 4,593
Income tax 193 1,607
Net of income taxes 360 2,986
Benefit plan adjustments (6,946) (7,863)
Income tax expense (benefit) 2,431 2,752
Net of income taxes (4,515) (5,111)
Accumulated other comprehensive loss $ (4,155) $ (2,125)