Other Comprehensive Loss Reclassification Adjustments from Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Reclassification adjustment for net gains on investment securities available-for-sale realized in net income, Before-Tax Amount	$ (71)	$ (53)	$ (315)
Reclassification adjustment for net gains on investment securities available-for-sale realized in net income, Tax	24	18	107
Reclassification adjustments for net gains on investment securities available-for-sale realized in net income	(47)	(35)	(208)
Reclassification adjustment for amortization of net actuarial loss realized in net income, Before-Tax Amount	165	56	0
Reclassification adjustment for amortization of net actuarial loss realized in net income, Tax	(56)	(19)	0
Reclassification adjustment for amortization of net actuarial loss realized in net income	109	37	0
Total reclassification adjustments	$ 62	$ 2	$ (208)