Parent Company Only Financial Statements - Income Statements (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Expense
Interest expense	$ 876	$ 691	$ 659	$ 477	$ 451	$ 435	$ 438	$ 405	$ 2,703	$ 1,730	$ 1,409
Other expense									2,167	2,466	2,382
Income (loss) before taxes and equity in undistributed income of subsidiary	5,202	4,942	4,766	4,438	3,991	4,580	4,183	2,926	19,349	15,679	12,254
Income tax benefit	1,254	1,424	1,373	1,280	2,354	1,840	1,691	1,155	5,332	7,039	4,869
Net Income	$ 3,948	$ 3,518	$ 3,393	$ 3,158	$ 1,637	$ 2,740	$ 2,492	$ 1,771	14,017	8,640	7,385
Parent Company
Income
Loss on fair value of financial liability									(424)	(882)	(518)
Dividends from subsidiary									6,947	4,291	424
Total income									6,523	3,409	(94)
Expense
Interest expense									422	302	240
Other expense									359	269	241
Total expense									781	571	481
Income (loss) before taxes and equity in undistributed income of subsidiary									5,742	2,838	(575)
Income tax benefit									(356)	(989)	(411)
Undistributed income of subsidiary									7,919	4,813	7,549
Net Income									$ 14,017	$ 8,640	$ 7,385