LOANS AND ALLOWANCE FOR LOAN LOSSES - Summary of Credit Exposure (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018
Financing Receivable Recorded Investment [Line Items]
Total loans	$ 1,693,847	$ 1,659,535	$ 1,593,474
Pass
Financing Receivable Recorded Investment [Line Items]
Total loans	1,674,631	1,642,415
Special Mention
Financing Receivable Recorded Investment [Line Items]
Total loans	4,265	6,641
Substandard
Financing Receivable Recorded Investment [Line Items]
Total loans	14,951	10,479
Commercial and industrial
Financing Receivable Recorded Investment [Line Items]
Total loans	286,190	261,779	234,396
Commercial and industrial | Pass
Financing Receivable Recorded Investment [Line Items]
Total loans	285,935	260,863
Commercial and industrial | Special Mention
Financing Receivable Recorded Investment [Line Items]
Total loans		224
Commercial and industrial | Substandard
Financing Receivable Recorded Investment [Line Items]
Total loans	255	692
Construction and development
Financing Receivable Recorded Investment [Line Items]
Total loans	231,167	237,503	211,745
Construction and development | Pass
Financing Receivable Recorded Investment [Line Items]
Total loans	229,233	236,253
Construction and development | Special Mention
Financing Receivable Recorded Investment [Line Items]
Total loans	600
Construction and development | Substandard
Financing Receivable Recorded Investment [Line Items]
Total loans	1,334	1,250
Commercial real estate
Financing Receivable Recorded Investment [Line Items]
Total loans	592,945	582,519	570,448
Commercial real estate | Pass
Financing Receivable Recorded Investment [Line Items]
Total loans	578,962	569,648
Commercial real estate | Special Mention
Financing Receivable Recorded Investment [Line Items]
Total loans	1,898	5,691
Commercial real estate | Substandard
Financing Receivable Recorded Investment [Line Items]
Total loans	12,085	7,180
Farmland
Financing Receivable Recorded Investment [Line Items]
Total loans	71,009	67,845	68,272
Farmland | Pass
Financing Receivable Recorded Investment [Line Items]
Total loans	70,723	67,541
Farmland | Special Mention
Financing Receivable Recorded Investment [Line Items]
Total loans	46	49
Farmland | Substandard
Financing Receivable Recorded Investment [Line Items]
Total loans	240	255
1-4 family residential
Financing Receivable Recorded Investment [Line Items]
Total loans	391,789	393,067	392,940
1-4 family residential | Pass
Financing Receivable Recorded Investment [Line Items]
Total loans	389,478	391,956
1-4 family residential | Special Mention
Financing Receivable Recorded Investment [Line Items]
Total loans	1,522	514
1-4 family residential | Substandard
Financing Receivable Recorded Investment [Line Items]
Total loans	789	597
Multi-family residential
Financing Receivable Recorded Investment [Line Items]
Total loans	44,699	38,386	39,023
Multi-family residential | Pass
Financing Receivable Recorded Investment [Line Items]
Total loans	44,699	38,386
Consumer and Overdrafts
Financing Receivable Recorded Investment [Line Items]
Total loans	56,327	55,159
Consumer and Overdrafts | Pass
Financing Receivable Recorded Investment [Line Items]
Total loans	56,203	55,055
Consumer and Overdrafts | Special Mention
Financing Receivable Recorded Investment [Line Items]
Total loans	91	48
Consumer and Overdrafts | Substandard
Financing Receivable Recorded Investment [Line Items]
Total loans	33	56
Agricultural
Financing Receivable Recorded Investment [Line Items]
Total loans	19,721	23,277	$ 23,362
Agricultural | Pass
Financing Receivable Recorded Investment [Line Items]
Total loans	19,398	22,713
Agricultural | Special Mention
Financing Receivable Recorded Investment [Line Items]
Total loans	108	115
Agricultural | Substandard
Financing Receivable Recorded Investment [Line Items]
Total loans	$ 215	$ 449