LOANS AND THE ALLOWANCE FOR LOAN LOSSES - Recorded investment in company's loans (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	$ 1,507,484	$ 996,559
Pass
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	1,477,935	973,472
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	12,036	1,158
Substandard
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	17,513	21,929
Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	0	0
Cash, Securities and Other
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	371,481	146,701
Cash, Securities and Other | Pass
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	371,415	143,898
Cash, Securities and Other | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	66	2,803
Construction and Development
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	105,717	28,120
Construction and Development | Pass
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	105,717	28,120
1-4 Family Residential
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	446,959	400,134
1-4 Family Residential | Pass
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	442,076	395,224
1-4 Family Residential | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	4,883	4,910
Non-Owner Occupied CRE
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	243,564	165,179
Non-Owner Occupied CRE | Pass
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	232,010	164,021
Non-Owner Occupied CRE | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	11,554	1,158
Owner Occupied CRE
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	154,138	127,968
Owner Occupied CRE | Pass
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	153,656	127,968
Owner Occupied CRE | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	482
Commercial and Industrial
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	185,625	128,457
Commercial and Industrial | Pass
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	173,061	114,241
Commercial and Industrial | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	$ 12,564	$ 14,216