LOANS AND ALLOWANCE FOR CREDIT LOSSES - Summary of Credit Exposure in Company Loan Portfolio (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($)
Financing Receivable Recorded Investment [Line Items]
Credit Exposure 2020	$ 166,402
Credit Exposure 2019	397,996
Credit Exposure 2018	283,284
Credit Exposure 2017	191,582
Credit Exposure 2016	197,235
Credit Exposure Prior	333,470
Revolving Loans Amortized Cost	148,384
Total	1,718,353
Credit Exposure 2020.Charge - offs	(49)
Credit Exposure 2019.Charge - offs	(17)
Credit Exposure 2018.Charge - offs	(61)
Credit Exposure 2017.Charge - offs	(38)
Credit Exposure Prior.Charge - offs	(59)
Total	(224)
Credit Exposure 2020, Recoveries	14
Credit Exposure 2017, Recoveries	4
Credit Exposure 2016, Recoveries	1
Credit Exposure Prior, Recoveries	3
Total	22
Credit Exposure 2020,Current period net	(35)
Credit Exposure 2019,Current period net	(17)
Credit Exposure 2018,Current period net	(61)
Credit Exposure 2017,Current period net	(34)
Credit Exposure 2016,Current period net	1
Credit Exposure Prior,Current period net	(56)
Total	(202)
Commercial and industrial
Financing Receivable Recorded Investment [Line Items]
Credit Exposure 2020	89,353
Credit Exposure 2019	44,914
Credit Exposure 2018	22,606
Credit Exposure 2017	9,380
Credit Exposure 2016	9,687
Credit Exposure Prior	19,465
Revolving Loans Amortized Cost	101,758
Total	297,163
Credit Exposure 2018.Charge - offs	(43)
Total	(43)
Credit Exposure 2018,Current period net	(43)
Total	(43)
Commercial and industrial | Pass
Financing Receivable Recorded Investment [Line Items]
Credit Exposure 2020	89,353
Credit Exposure 2019	44,914
Credit Exposure 2018	22,360
Credit Exposure 2017	9,359
Credit Exposure 2016	9,586
Credit Exposure Prior	19,274
Revolving Loans Amortized Cost	101,608
Total	296,454
Commercial and industrial | Substandard
Financing Receivable Recorded Investment [Line Items]
Credit Exposure 2018	218
Credit Exposure 2017	21
Credit Exposure 2016	58
Total	297
Commercial and industrial | Nonaccrual
Financing Receivable Recorded Investment [Line Items]
Credit Exposure 2018	28
Credit Exposure 2016	43
Credit Exposure Prior	191
Revolving Loans Amortized Cost	150
Total	412
Construction and development
Financing Receivable Recorded Investment [Line Items]
Credit Exposure 2020	29,946
Credit Exposure 2019	121,599
Credit Exposure 2018	55,948
Credit Exposure 2017	28,704
Credit Exposure 2016	10,867
Credit Exposure Prior	11,023
Revolving Loans Amortized Cost	5,886
Total	263,973
Construction and development | Pass
Financing Receivable Recorded Investment [Line Items]
Credit Exposure 2020	29,946
Credit Exposure 2019	119,807
Credit Exposure 2018	55,942
Credit Exposure 2017	28,704
Credit Exposure 2016	10,867
Credit Exposure Prior	11,023
Revolving Loans Amortized Cost	5,886
Total	262,175
Construction and development | Substandard
Financing Receivable Recorded Investment [Line Items]
Credit Exposure 2019	600
Credit Exposure 2018	6
Total	606
Construction and development | Nonaccrual
Financing Receivable Recorded Investment [Line Items]
Credit Exposure 2019	1,192
Total	1,192
Commercial real estate
Financing Receivable Recorded Investment [Line Items]
Credit Exposure 2020	17,610
Credit Exposure 2019	106,440
Credit Exposure 2018	102,547
Credit Exposure 2017	91,184
Credit Exposure 2016	106,972
Credit Exposure Prior	148,209
Revolving Loans Amortized Cost	11,921
Total	584,883
Commercial real estate | Pass
Financing Receivable Recorded Investment [Line Items]
Credit Exposure 2020	17,610
Credit Exposure 2019	106,440
Credit Exposure 2018	101,206
Credit Exposure 2017	86,620
Credit Exposure 2016	101,885
Credit Exposure Prior	137,737
Revolving Loans Amortized Cost	11,921
Total	563,419
Commercial real estate | Special Mention
Financing Receivable Recorded Investment [Line Items]
Credit Exposure Prior	70
Total	70
Commercial real estate | Substandard
Financing Receivable Recorded Investment [Line Items]
Credit Exposure 2018	1,183
Credit Exposure 2017	617
Credit Exposure Prior	9,358
Total	11,158
Commercial real estate | Nonaccrual
Financing Receivable Recorded Investment [Line Items]
Credit Exposure 2018	158
Credit Exposure 2017	3,947
Credit Exposure 2016	5,087
Credit Exposure Prior	1,044
Total	10,236
Farmland
Financing Receivable Recorded Investment [Line Items]
Credit Exposure 2020	5,423
Credit Exposure 2019	14,614
Credit Exposure 2018	14,202
Credit Exposure 2017	8,507
Credit Exposure 2016	11,353
Credit Exposure Prior	18,963
Revolving Loans Amortized Cost	5,573
Total	78,635
Farmland | Pass
Financing Receivable Recorded Investment [Line Items]
Credit Exposure 2020	5,423
Credit Exposure 2019	14,614
Credit Exposure 2018	14,202
Credit Exposure 2017	8,507
Credit Exposure 2016	11,353
Credit Exposure Prior	18,649
Revolving Loans Amortized Cost	5,573
Total	78,321
Farmland | Special Mention
Financing Receivable Recorded Investment [Line Items]
Credit Exposure Prior	41
Total	41
Farmland | Substandard
Financing Receivable Recorded Investment [Line Items]
Credit Exposure Prior	97
Total	97
Farmland | Nonaccrual
Financing Receivable Recorded Investment [Line Items]
Credit Exposure Prior	176
Total	176
1-4 family residential
Financing Receivable Recorded Investment [Line Items]
Credit Exposure 2020	12,890
Credit Exposure 2019	81,727
Credit Exposure 2018	65,931
Credit Exposure 2017	47,356
Credit Exposure 2016	54,561
Credit Exposure Prior	127,903
Revolving Loans Amortized Cost	10,237
Total	400,605
Credit Exposure Prior.Charge - offs	(59)
Total	(59)
Credit Exposure Prior, Recoveries	1
Total	1
Credit Exposure Prior,Current period net	(58)
Total	(58)
1-4 family residential | Pass
Financing Receivable Recorded Investment [Line Items]
Credit Exposure 2020	12,890
Credit Exposure 2019	81,727
Credit Exposure 2018	65,493
Credit Exposure 2017	46,797
Credit Exposure 2016	53,530
Credit Exposure Prior	125,807
Revolving Loans Amortized Cost	10,237
Total	396,481
1-4 family residential | Special Mention
Financing Receivable Recorded Investment [Line Items]
Credit Exposure 2018	55
Credit Exposure 2017	113
Credit Exposure Prior	70
Total	238
1-4 family residential | Nonaccrual
Financing Receivable Recorded Investment [Line Items]
Credit Exposure 2018	383
Credit Exposure 2017	446
Credit Exposure 2016	1,031
Credit Exposure Prior	2,026
Total	3,886
Multi-family residential
Financing Receivable Recorded Investment [Line Items]
Credit Exposure 2020	1,304
Credit Exposure 2019	4,837
Credit Exposure 2018	3,746
Credit Exposure 2017	1,515
Credit Exposure 2016	1,801
Credit Exposure Prior	6,665
Revolving Loans Amortized Cost	562
Total	20,430
Multi-family residential | Pass
Financing Receivable Recorded Investment [Line Items]
Credit Exposure 2020	1,304
Credit Exposure 2019	4,837
Credit Exposure 2018	3,746
Credit Exposure 2017	1,515
Credit Exposure 2016	1,801
Credit Exposure Prior	6,665
Revolving Loans Amortized Cost	562
Total	20,430
Consumer and Overdrafts
Financing Receivable Recorded Investment [Line Items]
Credit Exposure 2020	8,344
Credit Exposure 2019	20,946
Credit Exposure 2018	14,878
Credit Exposure 2017	3,720
Credit Exposure 2016	1,445
Credit Exposure Prior	846
Revolving Loans Amortized Cost	3,171
Total	53,350
Credit Exposure 2020.Charge - offs	(49)
Credit Exposure 2019.Charge - offs	(17)
Credit Exposure 2018.Charge - offs	(18)
Credit Exposure 2017.Charge - offs	(38)
Total	(122)
Credit Exposure 2020, Recoveries	14
Credit Exposure 2017, Recoveries	4
Credit Exposure 2016, Recoveries	1
Credit Exposure Prior, Recoveries	2
Total	21
Credit Exposure 2020,Current period net	(35)
Credit Exposure 2019,Current period net	(17)
Credit Exposure 2018,Current period net	(18)
Credit Exposure 2017,Current period net	(34)
Credit Exposure 2016,Current period net	1
Credit Exposure Prior,Current period net	2
Total	(101)
Consumer and Overdrafts | Pass
Financing Receivable Recorded Investment [Line Items]
Credit Exposure 2020	8,344
Credit Exposure 2019	20,857
Credit Exposure 2018	14,693
Credit Exposure 2017	3,694
Credit Exposure 2016	1,442
Credit Exposure Prior	843
Revolving Loans Amortized Cost	3,171
Total	53,044
Consumer and Overdrafts | Special Mention
Financing Receivable Recorded Investment [Line Items]
Credit Exposure 2019	39
Credit Exposure 2018	35
Credit Exposure 2017	3
Total	77
Consumer and Overdrafts | Nonaccrual
Financing Receivable Recorded Investment [Line Items]
Credit Exposure 2019	50
Credit Exposure 2018	150
Credit Exposure 2017	23
Credit Exposure 2016	3
Credit Exposure Prior	3
Total	229
Agricultural
Financing Receivable Recorded Investment [Line Items]
Credit Exposure 2020	1,532
Credit Exposure 2019	2,919
Credit Exposure 2018	3,426
Credit Exposure 2017	1,216
Credit Exposure 2016	549
Credit Exposure Prior	396
Revolving Loans Amortized Cost	9,276
Total	19,314
Agricultural | Pass
Financing Receivable Recorded Investment [Line Items]
Credit Exposure 2020	1,532
Credit Exposure 2019	2,919
Credit Exposure 2018	3,357
Credit Exposure 2017	1,146
Credit Exposure 2016	432
Credit Exposure Prior	391
Revolving Loans Amortized Cost	9,276
Total	19,053
Agricultural | Special Mention
Financing Receivable Recorded Investment [Line Items]
Credit Exposure 2017	70
Total	70
Agricultural | Substandard
Financing Receivable Recorded Investment [Line Items]
Credit Exposure 2016	85
Credit Exposure Prior	5
Total	90
Agricultural | Nonaccrual
Financing Receivable Recorded Investment [Line Items]
Credit Exposure 2018	69
Credit Exposure 2016	32
Total	$ 101