Stockholders' Equity and Earnings per Common Share (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Available-for-sale securities [Abstract]
Gain on sale of sale of available-for-sale securities, net	$ 2	$ 7	$ 89	$ 522
Tax benefit	1	2	30	177
Total	1	5	59	345
Other comprehensive income, pretax [Abstract]
Unrealized holding gains (losses) arising during the period			2,394	3,366
Reclassification adjustment for gains (loss) recognized in income, pretax	(2)	(7)	(89)	(522)
Net unrealized losses on securities, pretax			2,305	2,844
Total change in accumulated other comprehensive income or (loss), pretax			2,305	2,844
Other Comprehensive Income Tax Effect [Abstract]
Unrealized holding losses arising during the period			814	1,144
Reclassification adjustment for gains (losses) recognized in income, tax effect	(1)	(2)	(30)	(177)
Net unrealized losses on securities, tax effect			784	967
Other Comprehensive Income (Loss), Tax, Total			784	967
Other Comprehensive Income, Net of Tax [Abstract]
Unrealized holding losses arising during the period			1,580	2,222
Reclassification adjustment for gains recognized in income, net of tax	(1)	(5)	(59)	(345)
Net unrealized losses on securities, net of tax	$ 57	$ (299)	1,521	1,877
Other comprehensive income, net of tax (total)			$ 1,521	$ 1,877