LOANS AND ALLOWANCE FOR LOAN LOSSES - Summary of Credit Exposure (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018
Financing Receivable Recorded Investment [Line Items]
Total loans	$ 1,736,439	$ 1,659,535	$ 1,651,863
Pass
Financing Receivable Recorded Investment [Line Items]
Total loans	1,712,431	1,642,415
Special Mention
Financing Receivable Recorded Investment [Line Items]
Total loans	4,645	6,641
Substandard
Financing Receivable Recorded Investment [Line Items]
Total loans	19,363	10,479
Commercial and industrial
Financing Receivable Recorded Investment [Line Items]
Total loans	299,714	261,779	248,758
Commercial and industrial | Pass
Financing Receivable Recorded Investment [Line Items]
Total loans	299,358	260,863
Commercial and industrial | Special Mention
Financing Receivable Recorded Investment [Line Items]
Total loans	149	224
Commercial and industrial | Substandard
Financing Receivable Recorded Investment [Line Items]
Total loans	207	692
Construction and development
Financing Receivable Recorded Investment [Line Items]
Total loans	256,459	237,503	229,307
Construction and development | Pass
Financing Receivable Recorded Investment [Line Items]
Total loans	254,527	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	1,332	1,250
Commercial real estate
Financing Receivable Recorded Investment [Line Items]
Total loans	581,742	582,519	599,153
Commercial real estate | Pass
Financing Receivable Recorded Investment [Line Items]
Total loans	561,933	569,648
Commercial real estate | Special Mention
Financing Receivable Recorded Investment [Line Items]
Total loans	2,859	5,691
Commercial real estate | Substandard
Financing Receivable Recorded Investment [Line Items]
Total loans	16,950	7,180
Farmland
Financing Receivable Recorded Investment [Line Items]
Total loans	61,073	67,845	65,209
Farmland | Pass
Financing Receivable Recorded Investment [Line Items]
Total loans	60,792	67,541
Farmland | Special Mention
Financing Receivable Recorded Investment [Line Items]
Total loans	44	49
Farmland | Substandard
Financing Receivable Recorded Investment [Line Items]
Total loans	237	255
1-4 family residential
Financing Receivable Recorded Investment [Line Items]
Total loans	406,880	393,067	392,456
1-4 family residential | Pass
Financing Receivable Recorded Investment [Line Items]
Total loans	405,635	391,956
1-4 family residential | Special Mention
Financing Receivable Recorded Investment [Line Items]
Total loans	830	514
1-4 family residential | Substandard
Financing Receivable Recorded Investment [Line Items]
Total loans	415	597
Multi-family residential
Financing Receivable Recorded Investment [Line Items]
Total loans	58,198	38,386	38,523
Multi-family residential | Pass
Financing Receivable Recorded Investment [Line Items]
Total loans	58,198	38,386
Consumer and Overdrafts
Financing Receivable Recorded Investment [Line Items]
Total loans	53,645	55,159
Consumer and Overdrafts | Pass
Financing Receivable Recorded Investment [Line Items]
Total loans	53,495	55,055
Consumer and Overdrafts | Special Mention
Financing Receivable Recorded Investment [Line Items]
Total loans	61	48
Consumer and Overdrafts | Substandard
Financing Receivable Recorded Investment [Line Items]
Total loans	89	56
Agricultural
Financing Receivable Recorded Investment [Line Items]
Total loans	18,728	23,277	$ 24,184
Agricultural | Pass
Financing Receivable Recorded Investment [Line Items]
Total loans	18,493	22,713
Agricultural | Special Mention
Financing Receivable Recorded Investment [Line Items]
Total loans	102	115
Agricultural | Substandard
Financing Receivable Recorded Investment [Line Items]
Total loans	$ 133	$ 449