UNAUDITED QUARTERLY FINANCIAL DATA (Selected Consolidated Quarterly Financial Data) (Details) - USD ($) $ / shares in Units, $ 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
Quarterly Financial Information (Unaudited)
Interest income	$ 23,342	$ 21,907	$ 19,998	$ 18,693	$ 17,935	$ 16,401	$ 14,047	$ 12,441	$ 83,945	$ 60,864
Interest expense	4,381	3,556	2,603	2,177	2,293	2,437	2,281	1,660	12,717	8,671
Net interest income	18,961	18,351	17,395	16,516	15,642	13,964	11,766	10,781	71,228	52,193
Provision for loan losses	844	(453)	1,270	1,477	3,499	1,200	1,790	570	3,138	7,059
Net interest income after provision for loan losses	18,117	18,804	16,125	15,039	12,143	12,764	9,976	10,211	68,090	45,134
Non-interest income	2,188	2,012	2,649	5,312	6,178	2,233	1,573	1,245
Non-interest expense	11,602	10,355	10,275	11,238	9,779	8,590	7,141	7,234	43,471	32,745
Income before income taxes	8,703	10,461	8,499	9,113	8,542	6,407	4,408	4,222	36,775	23,578
Income tax expense	2,418	3,348	2,634	2,822	5,216	2,562	1,757	1,674	11,221	11,209
Net income	$ 6,285	$ 7,113	$ 5,865	$ 6,291	$ 3,326	$ 3,845	$ 2,651	$ 2,548	$ 25,554	$ 12,369
Basic earnings per common share (in dollars per share)	$ 0.77	$ 0.87	$ 0.72	$ 0.77	$ 0.50	$ 0.83	$ 0.57	$ 0.55	$ 3.12	$ 2.40
Diluted earnings per common share (in dollars per share)	$ 0.75	$ 0.85	$ 0.70	$ 0.75	$ 0.49	$ 0.82	$ 0.57	$ 0.55	$ 3.06	$ 2.34