LOANS, Purchased Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Purchased loans [Abstract]
Loans and leases receivable purchased with deteriorated credit quality	$ 11,321	$ 5,760
Contractual principal balance	14,784	7,251
Carrying amount, net of allowance	11,311	5,680
Decrease in loan allowance related to acquisitions	70
Increase in loan allowance related to acquisitions		31
Accretable Yield [Roll Forward]
Beginning Balance	185	204	$ 217
New loans purchased	1,151	0	0
Accretion of income	(128)	(19)	(13)
Income recognized upon full repayment	0	0	0
Reclassification from non-accretable difference	0	0	0
Disposals	0	0	0
Ending Balance	1,208	185	$ 204
Purchased Loans [Member]
Purchased loans [Abstract]
Carrying amount, net of allowance	208
Residential Real Estate [Member]
Purchased loans [Abstract]
Loans and leases receivable purchased with deteriorated credit quality	1,619	0
Commercial Real Estate [Member] | Owner Occupied [Member]
Purchased loans [Abstract]
Loans and leases receivable purchased with deteriorated credit quality	2,013	131
Commercial Real Estate [Member] | Non Owner Occupied [Member]
Purchased loans [Abstract]
Loans and leases receivable purchased with deteriorated credit quality	5,396	5,549
Commercial and Industrial [Member]
Purchased loans [Abstract]
Loans and leases receivable purchased with deteriorated credit quality	232	80
All Other [Member]
Purchased loans [Abstract]
Loans and leases receivable purchased with deteriorated credit quality	2,061	$ 0
First National Bankshares Corporation [Member] | Purchased Loans [Member]
Purchased loans [Abstract]
Loans and leases receivable purchased with deteriorated credit quality	7,286
Carrying amount, net of allowance	199
Accretable Yield [Roll Forward]
Acquired loans contractually required payment	10,040
Acquired loans expected cash flows	$ 8,437