LOANS AND ALLOWANCE FOR CREDIT LOSSES - Summary of Credit Exposure in Company Loan Portfolio (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2020 USD ($)
Financing Receivable Recorded Investment [Line Items]
Credit Exposure 2020	$ 506,489
Credit Exposure 2019	367,082
Credit Exposure 2018	267,751
Credit Exposure 2017	182,160
Credit Exposure 2016	188,067
Credit Exposure Prior	315,766
Revolving Loans Amortized Cost	130,125
Total	1,957,440
Credit Exposure 2020.Charge - offs	(83)
Credit Exposure 2019.Charge - offs	(24)
Credit Exposure 2018.Charge - offs	(79)
Credit Exposure 2017.Charge - offs	(38)
Credit Exposure Prior.Charge - offs	(59)
Total	(283)
Credit Exposure 2020, Recoveries	27
Credit Exposure 2019, Recoveries	1
Credit Exposure 2018, Recoveries	46
Credit Exposure 2017, Recoveries	7
Credit Exposure 2016, Recoveries	22
Credit Exposure Prior, Recoveries	20
Credit Exposure Revolving Loans Amortized Cost, Recoveries	29
Total	152
Credit Exposure 2020,Current period net	(56)
Credit Exposure 2019,Current period net	(23)
Credit Exposure 2018,Current period net	(33)
Credit Exposure 2017,Current period net	(31)
Credit Exposure 2016,Current period net	22
Credit Exposure Prior,Current period net	(39)
Credit Exposure Revolving Loans Amortized Cost,Current period net	29
Total	(131)
Commercial and industrial
Financing Receivable Recorded Investment [Line Items]
Credit Exposure 2020	342,132
Credit Exposure 2019	39,574
Credit Exposure 2018	19,412
Credit Exposure 2017	11,900
Credit Exposure 2016	9,563
Credit Exposure Prior	19,227
Revolving Loans Amortized Cost	80,440
Total	522,248
Credit Exposure 2018.Charge - offs	(43)
Total	(43)
Credit Exposure 2018, Recoveries	43
Credit Exposure Prior, Recoveries	14
Credit Exposure Revolving Loans Amortized Cost, Recoveries	29
Total	86
Credit Exposure Prior,Current period net	14
Credit Exposure Revolving Loans Amortized Cost,Current period net	29
Total	43
Commercial and industrial | Pass
Financing Receivable Recorded Investment [Line Items]
Credit Exposure 2020	342,132
Credit Exposure 2019	39,539
Credit Exposure 2018	19,145
Credit Exposure 2017	11,883
Credit Exposure 2016	9,506
Credit Exposure Prior	18,739
Revolving Loans Amortized Cost	75,191
Total	516,135
Commercial and industrial | Special Mention
Financing Receivable Recorded Investment [Line Items]
Credit Exposure Prior	488
Revolving Loans Amortized Cost	5,249
Total	5,737
Commercial and industrial | Substandard
Financing Receivable Recorded Investment [Line Items]
Credit Exposure 2018	216
Credit Exposure 2017	17
Credit Exposure 2016	57
Total	290
Commercial and industrial | Nonaccrual
Financing Receivable Recorded Investment [Line Items]
Credit Exposure 2019	35
Credit Exposure 2018	51
Total	86
Construction and development
Financing Receivable Recorded Investment [Line Items]
Credit Exposure 2020	63,527
Credit Exposure 2019	109,220
Credit Exposure 2018	35,107
Credit Exposure 2017	28,186
Credit Exposure 2016	9,755
Credit Exposure Prior	10,871
Revolving Loans Amortized Cost	9,316
Total	265,982
Construction and development | Pass
Financing Receivable Recorded Investment [Line Items]
Credit Exposure 2020	60,411
Credit Exposure 2019	106,373
Credit Exposure 2018	35,101
Credit Exposure 2017	27,185
Credit Exposure 2016	9,085
Credit Exposure Prior	10,871
Revolving Loans Amortized Cost	9,316
Total	258,342
Construction and development | Special Mention
Financing Receivable Recorded Investment [Line Items]
Credit Exposure 2020	209
Credit Exposure 2019	2,247
Credit Exposure 2017	1,001
Total	3,457
Construction and development | Substandard
Financing Receivable Recorded Investment [Line Items]
Credit Exposure 2020	2,907
Credit Exposure 2019	600
Credit Exposure 2018	6
Credit Exposure 2016	670
Total	4,183
Commercial real estate
Financing Receivable Recorded Investment [Line Items]
Credit Exposure 2020	41,486
Credit Exposure 2019	111,557
Credit Exposure 2018	109,913
Credit Exposure 2017	85,564
Credit Exposure 2016	102,424
Credit Exposure Prior	144,651
Revolving Loans Amortized Cost	10,466
Total	606,061
Commercial real estate | Pass
Financing Receivable Recorded Investment [Line Items]
Credit Exposure 2020	41,486
Credit Exposure 2019	108,723
Credit Exposure 2018	106,164
Credit Exposure 2017	73,624
Credit Exposure 2016	88,076
Credit Exposure Prior	129,566
Revolving Loans Amortized Cost	10,466
Total	558,105
Commercial real estate | Special Mention
Financing Receivable Recorded Investment [Line Items]
Credit Exposure 2019	1,643
Credit Exposure 2018	1,593
Credit Exposure 2017	7,374
Credit Exposure 2016	9,597
Credit Exposure Prior	4,732
Total	24,939
Commercial real estate | Substandard
Financing Receivable Recorded Investment [Line Items]
Credit Exposure 2018	1,999
Credit Exposure 2017	438
Credit Exposure Prior	9,313
Total	11,750
Commercial real estate | Nonaccrual
Financing Receivable Recorded Investment [Line Items]
Credit Exposure 2019	1,191
Credit Exposure 2018	157
Credit Exposure 2017	4,128
Credit Exposure 2016	4,751
Credit Exposure Prior	1,040
Total	11,267
Farmland
Financing Receivable Recorded Investment [Line Items]
Credit Exposure 2020	6,563
Credit Exposure 2019	13,815
Credit Exposure 2018	13,066
Credit Exposure 2017	7,919
Credit Exposure 2016	11,479
Credit Exposure Prior	18,556
Revolving Loans Amortized Cost	6,227
Total	77,625
Farmland | Pass
Financing Receivable Recorded Investment [Line Items]
Credit Exposure 2020	6,563
Credit Exposure 2019	13,815
Credit Exposure 2018	12,889
Credit Exposure 2017	7,919
Credit Exposure 2016	11,479
Credit Exposure Prior	18,258
Revolving Loans Amortized Cost	6,227
Total	77,150
Farmland | Special Mention
Financing Receivable Recorded Investment [Line Items]
Credit Exposure Prior	39
Total	39
Farmland | Substandard
Financing Receivable Recorded Investment [Line Items]
Credit Exposure Prior	139
Total	139
Farmland | Nonaccrual
Financing Receivable Recorded Investment [Line Items]
Credit Exposure 2018	177
Credit Exposure Prior	120
Total	297
1-4 family residential
Financing Receivable Recorded Investment [Line Items]
Credit Exposure 2020	33,776
Credit Exposure 2019	68,348
Credit Exposure 2018	60,701
Credit Exposure 2017	43,227
Credit Exposure 2016	51,443
Credit Exposure Prior	115,563
Revolving Loans Amortized Cost	10,532
Total	383,590
Credit Exposure Prior.Charge - offs	(59)
Total	(59)
Credit Exposure Prior, Recoveries	2
Total	2
Credit Exposure Prior,Current period net	(57)
Total	(57)
1-4 family residential | Pass
Financing Receivable Recorded Investment [Line Items]
Credit Exposure 2020	33,776
Credit Exposure 2019	68,348
Credit Exposure 2018	60,360
Credit Exposure 2017	42,784
Credit Exposure 2016	51,232
Credit Exposure Prior	113,953
Revolving Loans Amortized Cost	10,532
Total	380,985
1-4 family residential | Special Mention
Financing Receivable Recorded Investment [Line Items]
Credit Exposure Prior	54
Total	54
1-4 family residential | Nonaccrual
Financing Receivable Recorded Investment [Line Items]
Credit Exposure 2018	341
Credit Exposure 2017	443
Credit Exposure 2016	211
Credit Exposure Prior	1,556
Total	2,551
Multi-family residential
Financing Receivable Recorded Investment [Line Items]
Credit Exposure 2020	1,891
Credit Exposure 2019	4,540
Credit Exposure 2018	13,543
Credit Exposure 2017	1,464
Credit Exposure 2016	1,779
Credit Exposure Prior	5,868
Revolving Loans Amortized Cost	607
Total	29,692
Multi-family residential | Pass
Financing Receivable Recorded Investment [Line Items]
Credit Exposure 2020	1,891
Credit Exposure 2019	4,540
Credit Exposure 2018	13,543
Credit Exposure 2017	1,464
Credit Exposure 2016	1,779
Credit Exposure Prior	5,868
Revolving Loans Amortized Cost	607
Total	29,692
Consumer and Overdrafts
Financing Receivable Recorded Investment [Line Items]
Credit Exposure 2020	14,748
Credit Exposure 2019	17,584
Credit Exposure 2018	13,025
Credit Exposure 2017	2,948
Credit Exposure 2016	1,124
Credit Exposure Prior	720
Revolving Loans Amortized Cost	3,112
Total	53,261
Credit Exposure 2020.Charge - offs	(83)
Credit Exposure 2019.Charge - offs	(24)
Credit Exposure 2018.Charge - offs	(18)
Credit Exposure 2017.Charge - offs	(38)
Total	(163)
Credit Exposure 2020, Recoveries	27
Credit Exposure 2019, Recoveries	1
Credit Exposure 2018, Recoveries	3
Credit Exposure 2017, Recoveries	7
Credit Exposure 2016, Recoveries	2
Credit Exposure Prior, Recoveries	4
Total	44
Credit Exposure 2020,Current period net	(56)
Credit Exposure 2019,Current period net	(23)
Credit Exposure 2018,Current period net	(15)
Credit Exposure 2017,Current period net	(31)
Credit Exposure 2016,Current period net	2
Credit Exposure Prior,Current period net	4
Total	(119)
Consumer and Overdrafts | Pass
Financing Receivable Recorded Investment [Line Items]
Credit Exposure 2020	14,736
Credit Exposure 2019	17,510
Credit Exposure 2018	12,848
Credit Exposure 2017	2,928
Credit Exposure 2016	1,115
Credit Exposure Prior	719
Revolving Loans Amortized Cost	3,112
Total	52,968
Consumer and Overdrafts | Special Mention
Financing Receivable Recorded Investment [Line Items]
Credit Exposure 2020	12
Credit Exposure 2019	9
Credit Exposure 2018	43
Credit Exposure 2016	6
Total	70
Consumer and Overdrafts | Nonaccrual
Financing Receivable Recorded Investment [Line Items]
Credit Exposure 2019	65
Credit Exposure 2018	134
Credit Exposure 2017	20
Credit Exposure 2016	3
Credit Exposure Prior	1
Total	223
Agricultural
Financing Receivable Recorded Investment [Line Items]
Credit Exposure 2020	2,366
Credit Exposure 2019	2,444
Credit Exposure 2018	2,984
Credit Exposure 2017	952
Credit Exposure 2016	500
Credit Exposure Prior	310
Revolving Loans Amortized Cost	9,425
Total	18,981
Credit Exposure 2018.Charge - offs	(18)
Total	(18)
Credit Exposure 2016, Recoveries	20
Total	20
Credit Exposure 2018,Current period net	(18)
Credit Exposure 2016,Current period net	20
Total	2
Agricultural | Pass
Financing Receivable Recorded Investment [Line Items]
Credit Exposure 2020	2,366
Credit Exposure 2019	2,423
Credit Exposure 2018	2,944
Credit Exposure 2017	896
Credit Exposure 2016	383
Credit Exposure Prior	305
Revolving Loans Amortized Cost	9,425
Total	18,742
Agricultural | Special Mention
Financing Receivable Recorded Investment [Line Items]
Credit Exposure 2017	56
Total	56
Agricultural | Substandard
Financing Receivable Recorded Investment [Line Items]
Credit Exposure 2018	10
Credit Exposure 2016	117
Total	127
Agricultural | Nonaccrual
Financing Receivable Recorded Investment [Line Items]
Credit Exposure 2019	21
Credit Exposure 2018	30
Credit Exposure Prior	5
Total	$ 56