LOANS AND ALLOWANCE FOR LOAN LOSSES - Loan Impairment - (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Loans individually evaluated for impairment and average balance of impaired loans
Performing troubled debt restructurings excluded as allowed		$ 7,499
Unpaid Principal Balance
With an allowance recorded	$ 6,272	4,146	$ 3,244
With no related allowance recorded	17,236	15,230	29,397
Total impaired loans	23,508	19,376	32,641
Recorded Investment
With an allowance recorded	6,141	3,981	2,824
With no related allowance recorded	13,131	12,248	25,986
Total impaired loans	19,272	16,229	28,810
Allowance for Loan Losses Allocated
With an allowance recorded	1,800	1,429	1,050
Total impaired loans	1,800	1,429	1,050
Interest Income Recognized
Interest income recognized, no recorded allowance	365	342	164
Total impaired loans - interest income recognized	365	342	164
Cash Basis Income Recognized
Cash basis interest recognized, no recorded allowance	365	342	164
Total impaired loans - cash basis income recognized	365	342	164
Average recorded investment
Average Balance	17,695	19,996	29,029
Commercial
Allowance for Loan Losses Allocated
With an allowance recorded	898	92
Commercial | Commercial and industrial
Unpaid Principal Balance
With an allowance recorded	719	150	82
With no related allowance recorded	1,028	676	761
Recorded Investment
With an allowance recorded	689	150	64
With no related allowance recorded	322	655	491
Allowance for Loan Losses Allocated
With an allowance recorded	429	92	12
Interest Income Recognized
Interest income recognized, no recorded allowance		34	10
Total impaired loans - interest income recognized	53
Cash Basis Income Recognized
Cash basis interest recognized, no recorded allowance	53	34	10
Average recorded investment
Average Balance	805	1,165	308
Commercial | Agricultural
Unpaid Principal Balance
With an allowance recorded	1,441		397
With no related allowance recorded	254	7
Recorded Investment
With an allowance recorded	1,441		150
With no related allowance recorded	253	7
Allowance for Loan Losses Allocated
With an allowance recorded	469		150
Average recorded investment
Average Balance	998	31	195
Commercial Real Estate
Allowance for Loan Losses Allocated
With an allowance recorded	755	1,166
Commercial Real Estate | Farm
Unpaid Principal Balance
With an allowance recorded	1,106		76
With no related allowance recorded	506	496	864
Recorded Investment
With an allowance recorded	1,105		76
With no related allowance recorded	241	309	616
Allowance for Loan Losses Allocated
With an allowance recorded	360		21
Interest Income Recognized
Interest income recognized, no recorded allowance		12
Cash Basis Income Recognized
Cash basis interest recognized, no recorded allowance		12
Average recorded investment
Average Balance	933	401	875
Commercial Real Estate | Hotel
Unpaid Principal Balance
With no related allowance recorded	64		11,423
Recorded Investment
With no related allowance recorded	64		11,377
Average recorded investment
Average Balance	26	2,851	7,255
Commercial Real Estate | Construction and development
Unpaid Principal Balance
With no related allowance recorded	239	189	84
Recorded Investment
With no related allowance recorded	162	186	78
Interest Income Recognized
Interest income recognized, no recorded allowance		47
Cash Basis Income Recognized
Cash basis interest recognized, no recorded allowance		47
Average recorded investment
Average Balance	156	53	270
Commercial Real Estate | Other
Unpaid Principal Balance
With an allowance recorded	1,900	2,480	979
With no related allowance recorded	3,558	4,429	5,848
Recorded Investment
With an allowance recorded	1,755	2,363	889
With no related allowance recorded	2,652	3,291	4,186
Allowance for Loan Losses Allocated
With an allowance recorded	395	1,166	684
Interest Income Recognized
Interest income recognized, no recorded allowance	200	160	94
Cash Basis Income Recognized
Cash basis interest recognized, no recorded allowance	200	160	94
Average recorded investment
Average Balance	4,800	5,734	9,259
Residential
Allowance for Loan Losses Allocated
With an allowance recorded	147	171
Residential | 1-4 family
Unpaid Principal Balance
With an allowance recorded	1,091	1,357	1,543
With no related allowance recorded	9,215	6,718	7,325
Recorded Investment
With an allowance recorded	1,046	1,309	1,478
With no related allowance recorded	7,432	5,391	6,400
Allowance for Loan Losses Allocated
With an allowance recorded	146	167	178
Interest Income Recognized
Interest income recognized, no recorded allowance	53	49	28
Cash Basis Income Recognized
Cash basis interest recognized, no recorded allowance	53	49	28
Average recorded investment
Average Balance	7,642	7,362	8,062
Residential | Home equity
Unpaid Principal Balance
With an allowance recorded	15	159	167
With no related allowance recorded	2,233	2,589	2,847
Recorded Investment
With an allowance recorded	105	159	167
With no related allowance recorded	1,875	2,296	2,618
Allowance for Loan Losses Allocated
With an allowance recorded	1	4	5
Interest Income Recognized
Interest income recognized, no recorded allowance	47	17	15
Cash Basis Income Recognized
Cash basis interest recognized, no recorded allowance	47	17	15
Average recorded investment
Average Balance	2,212	2,268	2,535
Consumer | Direct
Unpaid Principal Balance
With no related allowance recorded	139	126	238
Recorded Investment
With no related allowance recorded	130	113	213
Interest Income Recognized
Interest income recognized, no recorded allowance	12	18	17
Cash Basis Income Recognized
Cash basis interest recognized, no recorded allowance	12	18	17
Average recorded investment
Average Balance	$ 123	130	264
Consumer | Indirect
Unpaid Principal Balance
With no related allowance recorded			7
Recorded Investment
With no related allowance recorded			7
Interest Income Recognized
Interest income recognized, no recorded allowance		5
Cash Basis Income Recognized
Cash basis interest recognized, no recorded allowance		5
Average recorded investment
Average Balance		$ 1	$ 6