OPERATING SEGMENTS (Details) - USD ($) $ 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
Segment Reporting Information [Line Items]
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
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 (loss)	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 (credit) 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 (loss) 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
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
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 (loss) before income taxes													63,068	56,446	27,017
Income tax (benefit) 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 (loss)													52,505	43,745	21,225
Total Assets	5,152,760				3,941,863				3,003,986				5,152,760	3,941,863	3,003,986
Net loans	3,109,290				2,597,260				2,055,195				3,109,290	2,597,260	2,055,195
Commercial/Retail Bank [Member]
Segment Reporting Information [Line Items]
Interest income													178,462	147,500	98,758
Interest expense													20,801	21,388	11,113
Net interest income (loss)													157,661	126,112	87,645
Provision (credit) for loan losses													25,076	3,781	2,259
Net interest income (loss) after provision for loan losses													132,585	122,331	85,386
Non-interest income													30,538	19,897	14,648
Non-interest expense													95,370	78,440	66,875
Income (loss) before income taxes													67,753	63,914	33,159
Income tax (benefit) expense													11,749	14,595	7,034
Net income (loss)													56,004	49,319	26,125
Total Assets	5,044,647				3,902,703				2,969,560				5,044,647	3,902,703	2,969,560
Net loans	3,099,675				2,584,385				2,038,395				3,099,675	2,584,385	2,038,395
Mortgage Banking Division [Member]
Segment Reporting Information [Line Items]
Interest income													866	1,003	1,209
Interest expense													270	417	524
Net interest income (loss)													596	586	685
Provision (credit) for loan losses													75	(43)	(139)
Net interest income (loss) after provision for loan losses													521	629	824
Non-interest income													10,446	5,988	4,048
Non-interest expense													5,596	4,310	3,848
Income (loss) before income taxes													5,371	2,181	1,024
Income tax (benefit) expense													1,359	490	254
Net income (loss)													4,012	1,691	770
Total Assets	33,525				26,231				23,865				33,525	26,231	23,865
Net loans	9,615				12,875				16,799				9,615	12,875	16,799
Holding Company [Member]
Segment Reporting Information [Line Items]
Interest income													20	26	11
Interest expense													5,593	4,918	3,454
Net interest income (loss)													(5,573)	(4,892)	(3,443)
Provision (credit) for loan losses														0	0
Net interest income (loss) after provision for loan losses													(5,573)	(4,892)	(3,443)
Non-interest income													892	1,062	1,865
Non-interest expense													5,375	5,819	5,588
Income (loss) before income taxes													(10,056)	(9,649)	(7,166)
Income tax (benefit) expense													(2,545)	(2,384)	(1,496)
Net income (loss)													(7,511)	(7,265)	(5,670)
Total Assets	$ 74,588				12,929				10,592				$ 74,588	12,929	10,592
Net loans					$ 0				$ 0					$ 0	$ 0