LOANS AND THE ALLOWANCE FOR LOAN LOSSES - Recorded investment in company's loans (Details) - USD ($)	Sep. 30, 2021	Dec. 31, 2020
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	$ 1,603,383,000	$ 1,534,185,000
Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	1,587,982,000	1,517,908,000
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	8,463,000	6,316,000
Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	6,938,000	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	293,837,000	357,020,000
Cash, Securities and Other | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	293,796,000	356,970,000
Cash, Securities and Other | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	41,000	50,000
Construction and Development
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	132,141,000	131,111,000
Construction and Development | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	129,618,000	131,111,000
Construction and Development | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	2,523,000
1-4 Family Residential
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	502,439,000	455,038,000
1-4 Family Residential | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	502,356,000	451,918,000
1-4 Family Residential | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	83,000	3,120,000
Non-Owner Occupied CRE
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	358,369,000	281,943,000
Non-Owner Occupied CRE | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	352,429,000	275,627,000
Non-Owner Occupied CRE | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	5,940,000	6,316,000
Owner Occupied CRE
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	167,638,000	163,042,000
Owner Occupied CRE | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	165,690,000	161,850,000
Owner Occupied CRE | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	1,948,000	1,192,000
Commercial and Industrial
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	148,959,000	146,031,000
Commercial and Industrial | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	144,093,000	140,432,000
Commercial and Industrial | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	$ 4,866,000	$ 5,599,000