LOANS, Purchased Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Purchased loans [Abstract]
Total carrying amount	$ 7,981	$ 11,296
Contractual principal balance	11,681	15,436
Carrying amount, net of allowance	7,981	11,296
Increase in loan allowance related to acquisitions	0	0
Accretable Yield [Roll Forward]
Beginning Balance	642	754	$ 1,208
New loans purchased	371	139	0
Accretion of income	(180)	(134)	(249)
Loans placed on non-accrual	(82)	(63)	0
Income recognized upon full repayment	(79)	(38)	(205)
Reclassifications from non-accretable difference	0	(16)	0
Disposals	(53)	0	0
Ending Balance	619	642	$ 754
Residential Real Estate [Member]
Purchased loans [Abstract]
Total carrying amount	2,565	2,665
Commercial Real Estate [Member] | Owner Occupied [Member]
Purchased loans [Abstract]
Total carrying amount	1,804	2,040
Commercial Real Estate [Member] | Non-Owner Occupied [Member]
Purchased loans [Abstract]
Total carrying amount	2,628	3,434
Commercial and Industrial [Member]
Purchased loans [Abstract]
Total carrying amount	305	1,720
Consumer [Member]
Purchased loans [Abstract]
Total carrying amount	22	0
Construction and Land [Member]
Purchased loans [Abstract]
Total carrying amount	483	1,212
All Other [Member]
Purchased loans [Abstract]
Total carrying amount	174	$ 225
First National Bank of Jackson [Member] | Purchased Loans [Member]
Purchased loans [Abstract]
Total carrying amount	1,333
Accretable Yield [Roll Forward]
Acquired loans contractually required payment	1,704
Acquired loans expected cash flows	1,384
First Bank of Charleston, Inc [Member] | Purchased Loans [Member]
Purchased loans [Abstract]
Total carrying amount	7,641
Accretable Yield [Roll Forward]
Acquired loans contractually required payment	9,876
Acquired loans expected cash flows	$ 7,780