Other Comprehensive Income (Loss) Tax Effects Allocated to Each Component of Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Other Comprehensive Income, before Tax [Abstract]
Net unrealized holding gains arising during the period on investment securities available-for-sale, Before Tax Amount	$ 512	$ 582	$ 853	$ 1,358
Reclassification adjustment for net gains on investment securities available-for-sale realized in net income, Before Tax Amount	(9)	(18)	(9)	(18)
Total other comprehensive income, Before Tax Amount	503	564	844	1,340
Other Comprehensive Income, Tax [Abstract]
Net unrealized holding gains arising during the period on investment securities available-for-sale, Tax	(174)	(198)	(290)	(462)
Reclassification adjustment for net gains on investment securities available-for-sale realized in net income, Tax	3	6	3	6
Total other comprehensive income income, Tax	(171)	(192)	(287)	(456)
Net unrealized holding gains arising during the period on investment securities available-for-sale	338	384	563	896
Reclassification adjustment for net gains on sales of investment securities available-for-sale realized in net income	(6)	(12)	(6)	(12)
Total other comprehensive income, Net of Tax Amount	$ 332	$ 372	$ 557	$ 884