LOANS AND ALLOWANCE FOR LOAN LOSSES - Summary of Payment Status of Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due loans	$ 8,296	$ 14,986
Current	1,698,099	1,644,549
Ending balance	1,706,395	1,659,535	$ 1,359,544
Financing Receivables, 30 to 59 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due loans	4,704	6,712
Financing Receivables, 60 to 89 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due loans	1,754	4,088
Financing Receivables, Equal to Greater than 90 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due loans	1,838	4,186
Commercial and industrial
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due loans	389	968
Current	279,194	260,811
Ending balance	279,583	261,779	197,508
Commercial and industrial | Financing Receivables, 30 to 59 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due loans	321	209
Commercial and industrial | Financing Receivables, 60 to 89 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due loans	53	493
Commercial and industrial | Financing Receivables, Equal to Greater than 90 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due loans	15	266
Construction and development
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due loans	161	3,551
Current	280,337	233,952
Ending balance	280,498	237,503	196,774
Construction and development | Financing Receivables, 30 to 59 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due loans	161	735
Construction and development | Financing Receivables, 60 to 89 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due loans		2,816
Commercial real estate
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due loans	2,112	5,033
Current	565,248	577,486
Ending balance	567,360	582,519	418,137
Commercial real estate | Financing Receivables, 30 to 59 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due loans	1,181	1,803
Commercial real estate | Financing Receivables, 60 to 89 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due loans	49	3
Commercial real estate | Financing Receivables, Equal to Greater than 90 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due loans	882	3,227
Farmland
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due loans	103	485
Current	57,373	67,360
Ending balance	57,476	67,845	59,023
Farmland | Financing Receivables, 30 to 59 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due loans	103	485
1-4 family residential
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due loans	4,792	4,111
Current	407,374	388,956
Ending balance	412,166	393,067	374,371
1-4 family residential | Financing Receivables, 30 to 59 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due loans	2,514	2,849
1-4 family residential | Financing Receivables, 60 to 89 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due loans	1,433	666
1-4 family residential | Financing Receivables, Equal to Greater than 90 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due loans	845	596
Multi-family residential
Financing Receivable Recorded Investment Past Due [Line Items]
Current	37,379	38,386
Ending balance	37,379	38,386	36,574
Consumer
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due loans	621	633
Current	52,624	54,144
Ending balance	53,245	54,777	51,267
Consumer | Financing Receivables, 30 to 59 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due loans	373	526
Consumer | Financing Receivables, 60 to 89 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due loans	152	51
Consumer | Financing Receivables, Equal to Greater than 90 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due loans	96	56
Agricultural
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due loans	118	205
Current	18,241	23,072
Ending balance	18,359	23,277	25,596
Agricultural | Financing Receivables, 30 to 59 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due loans	51	105
Agricultural | Financing Receivables, 60 to 89 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due loans	67	59
Agricultural | Financing Receivables, Equal to Greater than 90 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due loans		41
Overdrafts
Financing Receivable Recorded Investment Past Due [Line Items]
Current	329	382
Ending balance	$ 329	$ 382	$ 294