LOANS AND ALLOWANCE FOR LOAN LOSSES - Summary of Payment Status of Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	$ 8,623	$ 11,700
Current	1,298,752	1,233,435
Ending balance	1,307,375	1,245,135	$ 1,229,341
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	3,709	7,346
60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	1,137	1,220
90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	3,777	3,134
Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	336	1,071
Current	192,327	222,926
Ending balance	192,663	223,997	224,617
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	246	941
Commercial and industrial | 60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	60	105
Commercial and industrial | 90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	30	25
Construction and development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	77	1,898
Current	200,990	127,468
Ending balance	201,067	129,366	125,045
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	77	73
Construction and development | 60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	0	0
Construction and development | 90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	0	1,825
Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	1,559	1,795
Current	391,755	365,861
Ending balance	393,314	367,656	360,676
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	0	1,629
Commercial real estate | 60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	38	32
Commercial real estate | 90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	1,521	134
Farmland
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	8	133
Current	54,341	62,229
Ending balance	54,349	62,362	61,902
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	2	100
Farmland | 60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	0	26
Farmland | 90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	6	7
1-4 family residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	5,433	5,568
Current	360,456	357,384
Ending balance	365,889	362,952	348,401
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	2,701	3,724
1-4 family residential | 60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	838	803
1-4 family residential | 90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	1,894	1,041
Multi-family residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	228	256
Current	23,007	25,823
Ending balance	23,235	26,079	34,538
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	207
Multi-family residential | 60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	0	49
Multi-family residential | 90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	228	0
Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	912	905
Current	50,799	52,600
Ending balance	51,711	53,505	54,345
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	617	613
Consumer | 60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	201	205
Consumer | 90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	94	87
Agricultural
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	70	74
Current	24,379	18,827
Ending balance	24,449	18,901	19,223
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	66	59
Agricultural | 60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	0	0
Agricultural | 90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	4	15
Overdrafts
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	0	0
Current	698	317
Ending balance	698	317	$ 594
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