OPERATING SEGMENTS (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	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, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Interest income	$ 40,444	$ 37,241	$ 37,571	$ 33,273	$ 30,555	$ 25,628	$ 25,037	$ 18,758	$ 17,143	$ 16,708	$ 16,464	$ 15,753	$ 148,529	$ 99,978	$ 66,069
Interest expense	7,000	6,782	6,799	6,142	5,285	3,959	3,468	2,379	1,922	1,773	1,629	1,585	26,723	15,091	6,909
Net interest income (loss)	33,444	30,459	30,772	27,131	25,270	21,669	21,569	16,379	15,221	14,935	14,835	14,168	121,806	84,887	59,160
Provision (credit) for loan losses	850	974	791	1,123	574	412	857	277	122	90	248	46	3,738	2,120	506
Net interest income (loss) after provision for loan losses	32,594	29,485	29,981	26,008	24,696	21,257	20,712	16,102	15,099	14,845	14,587	14,122	118,068	82,767	58,654
Non-interest income	7,574	7,103	6,716	5,554	6,396	5,074	5,632	3,459	3,556	3,658	3,757	3,391	26,947	20,561	14,363
Non-interest expense	24,960	20,825	20,891	21,893	22,249	19,786	19,680	14,596	12,390	11,888	15,070	16,095	88,569	76,311	55,446
Income (loss) before income taxes													56,446	27,017	17,571
Income tax (benefit) expense	3,353	$ 3,491	$ 3,823	$ 2,034	1,982	$ 1,383	$ 1,419	$ 1,008	3,851	$ 1,901	$ 908	$ 296	12,701	5,792	6,955
Net income (loss)													43,745	21,225	10,616
Total Assets	3,941,863				3,003,986				1,813,238				3,941,863	3,003,986	1,813,238
Net loans	2,597,260				2,055,195				1,221,808				2,597,260	2,055,195	1,221,808
Commercial/Retail Bank [Member]
Segment Reporting Information [Line Items]
Interest income													147,500	98,758	65,118
Interest expense													21,388	11,113	6,048
Net interest income (loss)													126,112	87,645	59,070
Provision (credit) for loan losses													3,781	2,259	475
Net interest income (loss) after provision for loan losses													122,331	85,386	58,595
Non-interest income													19,897	14,648	9,807
Non-interest expense													78,440	66,875	49,143
Income (loss) before income taxes													63,914	33,159	19,259
Income tax (benefit) expense													14,595	7,034	7,740
Net income (loss)													49,319	26,125	11,519
Total Assets	3,902,703				2,969,560				1,758,778				3,902,703	2,969,560	1,758,778
Net loans	2,584,385				2,038,395				1,196,365				2,584,385	2,038,395	1,196,365
Mortgage Banking Division [Member]
Segment Reporting Information [Line Items]
Interest income													1,003	1,209	943
Interest expense													417	524	1
Net interest income (loss)													586	685	942
Provision (credit) for loan losses													(43)	(139)	31
Net interest income (loss) after provision for loan losses													629	824	911
Non-interest income													5,988	4,048	4,505
Non-interest expense													4,310	3,848	3,857
Income (loss) before income taxes													2,181	1,024	1,559
Income tax (benefit) expense													490	254	437
Net income (loss)													1,691	770	1,122
Total Assets	26,231				23,865				32,234				26,231	23,865	32,234
Net loans	12,875				16,799				25,443				12,875	16,799	25,443
Holding Company [Member]
Segment Reporting Information [Line Items]
Interest income													26	11	8
Interest expense													4,918	3,454	860
Net interest income (loss)													(4,892)	(3,443)	(852)
Provision (credit) for loan losses													0	0	0
Net interest income (loss) after provision for loan losses													(4,892)	(3,443)	(852)
Non-interest income													1,062	1,865	51
Non-interest expense													5,819	5,588	2,446
Income (loss) before income taxes													(9,649)	(7,166)	(3,247)
Income tax (benefit) expense													(2,384)	(1,496)	(1,222)
Net income (loss)													(7,265)	(5,670)	(2,025)
Total Assets	12,929				10,592				22,226				12,929	10,592	22,226
Net loans	$ 0				$ 0				$ 0				$ 0	$ 0	$ 0