Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accumulated Other Comprehensive Loss [Abstract]
Net unrealized gains on securities	$ (20)	$ 1,138
Tax effect	7	(387)
Net of tax amount	(13)	751
Accumulated pension adjustment	(6,366)	(6,777)	$ (6,858)
Tax effect	2,164	2,304	2,332
Net of tax amount	(4,202)	(4,473)	$ (4,526)
Total accumulated other comprehensive loss	$ (4,215)	$ (3,722)