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LOANS AND ALLOWANCE FOR LOAN LOSSES - Summary of Payment Status of Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	$ 14,986	$ 9,343
Current	1,644,549	1,350,201
Total Loans	1,659,535	1,359,544	$ 1,243,925
Recorded Investment Greater than 90 Days and Accruing	0	0
30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	6,712	6,304
60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	4,088	845
90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	4,186	2,194
Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	968	1,383
Current	260,811	196,125
Total Loans	261,779	197,508	223,712
Recorded Investment Greater than 90 Days and Accruing	0	0
Commercial and industrial | 30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	209	1,273
Commercial and industrial | 60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	493	93
Commercial and industrial | 90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	266	17
Construction and development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	3,551	117
Current	233,952	196,657
Total Loans	237,503	196,774	129,631
Recorded Investment Greater than 90 Days and Accruing	0	0
Construction and development | 30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	735	117
Construction and development | 60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	2,816	0
Construction and development | 90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	0	0
Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	5,033	1,524
Current	577,486	416,613
Total Loans	582,519	418,137	368,077
Recorded Investment Greater than 90 Days and Accruing	0	0
Commercial real estate | 30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	1,803	192
Commercial real estate | 60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	3	265
Commercial real estate | 90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	3,227	1,067
Farmland
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	485	145
Current	67,360	58,878
Total Loans	67,845	59,023	62,366
Recorded Investment Greater than 90 Days and Accruing	0	0
Farmland | 30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	485	139
Farmland | 60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	0	0
Farmland | 90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	0	6
1-4 family residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	4,111	5,214
Current	388,956	369,157
Total Loans	393,067	374,371	361,665
Recorded Investment Greater than 90 Days and Accruing	0	0
1-4 family residential | 30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	2,849	3,998
1-4 family residential | 60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	666	416
1-4 family residential | 90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	596	800
Multi-family residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	0	217
Current	38,386	36,357
Total Loans	38,386	36,574	26,079
Recorded Investment Greater than 90 Days and Accruing	0	0
Multi-family residential | 30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	0	0
Multi-family residential | 60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	0	0
Multi-family residential | 90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	0	217
Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	633	537
Current	54,144	50,730
Total Loans	54,777	51,267	53,177
Recorded Investment Greater than 90 Days and Accruing	0	0
Consumer | 30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	526	381
Consumer | 60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	51	69
Consumer | 90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	56	87
Agricultural
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	205	206
Current	23,072	25,390
Total Loans	23,277	25,596	18,901
Recorded Investment Greater than 90 Days and Accruing	0	0
Agricultural | 30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	105	204
Agricultural | 60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	59	2
Agricultural | 90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	41	0
Overdrafts
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	0	0
Current	382	294
Total Loans	382	294	$ 317
Recorded Investment Greater than 90 Days and Accruing	0	0
Overdrafts | 30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	0	0
Overdrafts | 60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	0	0
Overdrafts | 90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	$ 0	$ 0

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Recorded investment in financing receivables that are 90 days or more past due and still accruing.

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