LOANS AND THE ALLOWANCE FOR LOAN LOSSES - Recorded investment in company's loans (Details) - USD ($)	Jun. 30, 2021	Dec. 31, 2020
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	$ 1,573,015,000	$ 1,534,185,000
Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	1,561,315,000	1,517,908,000
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	5,981,000	6,316,000
Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	5,719,000	9,961,000
Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	0	0
Cash, Securities and Other
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	290,907,000	357,020,000
Cash, Securities and Other | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	290,892,000	356,970,000
Cash, Securities and Other | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	15,000	50,000
Construction and Development
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	127,141,000	131,111,000
Construction and Development | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	127,141,000	131,111,000
1-4 Family Residential
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	496,101,000	455,038,000
1-4 Family Residential | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	496,101,000	451,918,000
1-4 Family Residential | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment		3,120,000
Non-Owner Occupied CRE
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	324,493,000	281,943,000
Non-Owner Occupied CRE | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	318,512,000	275,627,000
Non-Owner Occupied CRE | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	5,981,000	6,316,000
Owner Occupied CRE
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	178,847,000	163,042,000
Owner Occupied CRE | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	178,146,000	161,850,000
Owner Occupied CRE | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	701,000	1,192,000
Commercial and Industrial
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	155,526,000	146,031,000
Commercial and Industrial | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	150,523,000	140,432,000
Commercial and Industrial | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	$ 5,003,000	$ 5,599,000