SUMMARY OF QUARTERLY RESULTS OF OPERATIONS AND PER SHARE AMOUNTS (UNAUDITED) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
SUMMARY OF QUARTERLY RESULTS OF OPERATIONS AND PER SHARE AMOUNTS (UNAUDITED)
Total interest income	$ 45,613	$ 46,338	$ 45,799	$ 41,598	$ 40,444	$ 37,241	$ 37,571	$ 33,273	$ 30,555	$ 25,628	$ 25,037	$ 18,758	$ 179,348	$ 148,529	$ 99,978
Total interest expense	6,147	6,365	6,619	7,533	7,000	6,782	6,799	6,142	5,285	3,959	3,468	2,379	26,664	26,723	15,091
Net interest income	39,466	39,973	39,180	34,065	33,444	30,459	30,772	27,131	25,270	21,669	21,569	16,379	152,684	121,806	84,887
Provision for loan losses	3,522	6,921	7,606	7,102	850	974	791	1,123	574	412	857	277	25,151	3,738	2,120
Net interest income after provision for loan losses	35,944	33,052	31,574	26,963	32,594	29,485	29,981	26,008	24,696	21,257	20,712	16,102	127,533	118,068	82,767
Total non-interest income	10,928	8,794	15,680	6,474	7,574	7,103	6,716	5,554	6,396	5,074	5,632	3,459	41,876	26,947	20,561
Total non-interest expense	27,896	26,936	28,070	23,439	24,960	20,825	20,891	21,893	22,249	19,786	19,680	14,596	106,341	88,569	76,311
Income tax expense	3,642	2,993	2,241	1,687	3,353	3,491	3,823	2,034	1,982	1,383	1,419	1,008	10,563	12,701	5,792
Net income available to common stockholders	$ 15,334	$ 11,917	$ 16,943	$ 8,311	$ 11,855	$ 12,272	$ 11,983	$ 7,635	$ 6,861	$ 5,162	$ 5,245	$ 3,957	$ 52,505	$ 43,745	$ 21,225
Per common share:
Net income, basic	$ 0.72	$ 0.56	$ 0.79	$ 0.44	$ 0.64	$ 0.71	$ 0.69	$ 0.48	$ 0.48	$ 0.39	$ 0.40	$ 0.34	$ 2.53	$ 2.57	$ 1.63
Diluted earnings per share	0.72	0.55	0.79	0.44	0.72	0.74	0.70	0.63	0.48	0.39	0.40	0.34	2.52	2.55	1.62
Cash dividends declared	$ 0.12	$ 0.10	$ 0.10	$ 0.10	$ 0.08	$ 0.08	$ 0.08	$ 0.07	$ 0.05	$ 0.05	$ 0.05	$ 0.05	$ 0.42	$ 0.31	$ 0.20