Parent Company Only Financial Statements II (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income
Gain on redemption of JR subordinated debentures									$ 0	$ 0	$ 78
Expense
Interest expense	$ 451	$ 435	$ 438	$ 405	$ 395	$ 349	$ 330	$ 335	1,730	1,409	1,281
Other expense									2,537	2,382	2,444
Income (loss) before taxes and equity in undistributed income of subsidiary	3,991	4,580	4,183	2,926	2,781	3,322	3,257	2,894	15,679	12,254	11,307
Income tax benefit	2,354	1,840	1,691	1,155	1,226	1,282	1,236	1,125	7,039	4,869	4,497
Net Income	$ 1,637	$ 2,740	$ 2,492	$ 1,771	$ 1,555	$ 2,040	$ 2,021	$ 1,769	8,640	7,385	6,810
Parent Company
Income
Loss on fair value of financial liability									(882)	(518)	(73)
Gain on redemption of JR subordinated debentures									0	0	78
Dividends from subsidiary									4,291	424	2,416
Total income									3,409	(94)	2,421
Expense
Interest expense									302	240	225
Other expense									269	241	256
Total expense									571	481	481
Income (loss) before taxes and equity in undistributed income of subsidiary									2,838	(575)	1,940
Income tax benefit									(989)	(411)	(196)
Undistributed income of subsidiary									4,813	7,549	4,674
Net Income									$ 8,640	$ 7,385	$ 6,810