Other Comprehensive Loss Tax Effects Allocated to Each Component of Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Other Comprehensive Income, before Tax [Abstract]
Net unrealized holding (losses) gains arising during the year on investment securities available-for-sale, Before-Tax Amount	$ (894)	$ (279)	$ 1,383
Reclassification adjustment for net gains on investment securities available-for-sale realized in net income, Before-Tax Amount	(71)	(53)	(315)
Total Investment securities available-for-sale, Before-Tax Amount	(965)	(332)	1,068
Net actuarial loss arising during the year, Before-Tax Amount	(680)	(1,121)	(3,276)
Reclassification adjustment for amortization of net actuarial loss realized in net income, Before-Tax Amount	165	56	0
Total Defined benefit pension plan, Before-Tax Amount	(515)	(1,065)	(3,276)
Total other comprehensive loss, Before-Tax Amount	(1,480)	(1,397)	(2,208)
Other Comprehensive Income, Tax [Abstract]
Net unrealized holding (losses) gains arising during the period on investment securities available-for-sale, Tax	304	95	(470)
Reclassification adjustment for net gains on investment securities available-for-sale realized in net income, Tax	24	18	107
Total Investment securities available-for-sale, Tax	328	113	(363)
Net actuarial loss arising during the year, Tax	231	381	1,114
Reclassification adjustment for amortization of net actuarial loss realized in net income, Tax	(56)	(19)	0
Total Defined benefit pension plan, Tax	175	362	1,114
Total other comprehensive loss, Tax	503	475	751
Net unrealized holding (losses) gains arising during the year on investment securities available-for-sale	(590)	(184)	913
Reclassification adjustments for net gains on investment securities available-for-sale realized in net income	(47)	(35)	(208)
Total	(637)	(219)	705
Net actuarial loss arising during the year	(449)	(740)	(2,162)
Reclassification adjustment for amortization of net actuarial loss realized in net income	109	37	0
Total	(340)	(703)	(2,162)
Total other comprehensive loss	$ (977)	$ (922)	$ (1,457)