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LOANS AND ALLOWANCE FOR LOAN LOSSES - Summary of Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Recorded Investment [Abstract]
Recorded Investment, With no related allowance recorded	$ 8,481	$ 5,062
Recorded Investment, With related allowance recorded	1,681	1,256
Recorded Investment	10,162	6,318
Unpaid Principal Balance [Abstract]
Unpaid Principal Balance, With no related allowance recorded	8,481	5,062
Unpaid Principal Balance, With related allowance recorded	1,681	1,256
Unpaid Principal Balance	10,162	6,318
Related Allowance [Abstract]
Related Allowance	241	253
Average Recorded Investment [Abstract]
Average Recorded Investment, With no related allowance recorded	8,473	3,695
Average Recorded Investment, With related allowance recorded	1,747	4,118
Average Recorded Investment	10,220	7,813
Interest Income Recognized [Abstract]
Interest Income Recognized, With no related allowance recorded	114	260
Interest Income Recognized, With related allowance recorded	18	57
Interest Income Recognized	132	317
Commercial and industrial
Recorded Investment [Abstract]
Recorded Investment, With no related allowance recorded	373	28
Recorded Investment, With related allowance recorded	546	203
Unpaid Principal Balance [Abstract]
Unpaid Principal Balance, With no related allowance recorded	373	28
Unpaid Principal Balance, With related allowance recorded	546	203
Related Allowance [Abstract]
Related Allowance	129	64
Average Recorded Investment [Abstract]
Average Recorded Investment, With no related allowance recorded	159	809
Average Recorded Investment, With related allowance recorded	624	3,153
Interest Income Recognized [Abstract]
Interest Income Recognized, With no related allowance recorded	5	3
Interest Income Recognized, With related allowance recorded	10	4
Construction and development
Recorded Investment [Abstract]
Recorded Investment, With no related allowance recorded	0	1,825
Unpaid Principal Balance [Abstract]
Unpaid Principal Balance, With no related allowance recorded	0	1,825
Average Recorded Investment [Abstract]
Average Recorded Investment, With no related allowance recorded	1,217	172
Interest Income Recognized [Abstract]
Interest Income Recognized, With no related allowance recorded	0	84
Commercial real estate
Recorded Investment [Abstract]
Recorded Investment, With no related allowance recorded	5,893	1,196
Recorded Investment, With related allowance recorded	518
Unpaid Principal Balance [Abstract]
Unpaid Principal Balance, With no related allowance recorded	5,893	1,196
Unpaid Principal Balance, With related allowance recorded	518
Related Allowance [Abstract]
Related Allowance	31
Average Recorded Investment [Abstract]
Average Recorded Investment, With no related allowance recorded	4,936	871
Average Recorded Investment, With related allowance recorded	251
Interest Income Recognized [Abstract]
Interest Income Recognized, With no related allowance recorded	73	47
Interest Income Recognized, With related allowance recorded	3
Farmland
Recorded Investment [Abstract]
Recorded Investment, With no related allowance recorded	7	89
Recorded Investment, With related allowance recorded	163	169
Unpaid Principal Balance [Abstract]
Unpaid Principal Balance, With no related allowance recorded	7	89
Unpaid Principal Balance, With related allowance recorded	163	169
Related Allowance [Abstract]
Related Allowance	41	47
Average Recorded Investment [Abstract]
Average Recorded Investment, With no related allowance recorded	65	109
Average Recorded Investment, With related allowance recorded	163	169
Interest Income Recognized [Abstract]
Interest Income Recognized, With no related allowance recorded	0	5
Interest Income Recognized, With related allowance recorded	0	1
1-4 family residential
Recorded Investment [Abstract]
Recorded Investment, With no related allowance recorded	1,315	1,799
Recorded Investment, With related allowance recorded	454	789
Unpaid Principal Balance [Abstract]
Unpaid Principal Balance, With no related allowance recorded	1,315	1,799
Unpaid Principal Balance, With related allowance recorded	454	789
Related Allowance [Abstract]
Related Allowance	40	108
Average Recorded Investment [Abstract]
Average Recorded Investment, With no related allowance recorded	1,675	1,575
Average Recorded Investment, With related allowance recorded	609	639
Interest Income Recognized [Abstract]
Interest Income Recognized, With no related allowance recorded	18	106
Interest Income Recognized, With related allowance recorded	5	44
Multi-family residential
Recorded Investment [Abstract]
Recorded Investment, With no related allowance recorded	247	5
Unpaid Principal Balance [Abstract]
Unpaid Principal Balance, With no related allowance recorded	247	5
Average Recorded Investment [Abstract]
Average Recorded Investment, With no related allowance recorded	102	2
Interest Income Recognized [Abstract]
Interest Income Recognized, With no related allowance recorded	4	1
Consumer
Recorded Investment [Abstract]
Recorded Investment, With no related allowance recorded	34	105
Recorded Investment, With related allowance recorded	0	95
Unpaid Principal Balance [Abstract]
Unpaid Principal Balance, With no related allowance recorded	34	105
Unpaid Principal Balance, With related allowance recorded	0	95
Related Allowance [Abstract]
Related Allowance	0	34
Average Recorded Investment [Abstract]
Average Recorded Investment, With no related allowance recorded	105	89
Average Recorded Investment, With related allowance recorded	100	155
Interest Income Recognized [Abstract]
Interest Income Recognized, With no related allowance recorded	1	12
Interest Income Recognized, With related allowance recorded		8
Agricultural
Recorded Investment [Abstract]
Recorded Investment, With no related allowance recorded	612	15
Recorded Investment, With related allowance recorded		0
Unpaid Principal Balance [Abstract]
Unpaid Principal Balance, With no related allowance recorded	612	15
Unpaid Principal Balance, With related allowance recorded		0
Related Allowance [Abstract]
Related Allowance		0
Average Recorded Investment [Abstract]
Average Recorded Investment, With no related allowance recorded	214	68
Average Recorded Investment, With related allowance recorded		2
Interest Income Recognized [Abstract]
Interest Income Recognized, With no related allowance recorded	$ 13	2
Interest Income Recognized, With related allowance recorded		$ 0

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