SECURITIES SOLD UNDER AGREEMENTS TO REPURCHASE (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Summary of securities sold under agreements to repurchase [Abstract]
Securities sold under agreements to repurchase	$ 10,000	$ 27,606	$ 28,453
Maximum month-end balance	25,718	30,497	32,145
Average balance during year	$ 14,207	$ 29,120	$ 30,236
Weighted-average interest rate at December 31	3.72%	3.02%	2.93%
Average interest rate paid during year	3.37%	2.92%	2.80%
Securities sold under agreements to repurchase	$ 11,798	$ 38,276
Excess collateral held	(1,798)	(10,670)
Securities sold under agreements to repurchase	10,000	27,606	$ 28,453
Overnight and Continuous
Summary of securities sold under agreements to repurchase [Abstract]
Securities sold under agreements to repurchase	0	7,606
Securities sold under agreements to repurchase	0	13,092
Excess collateral held	0	(5,486)
Securities sold under agreements to repurchase	0	7,606
Up to 1 Year
Summary of securities sold under agreements to repurchase [Abstract]
Securities sold under agreements to repurchase	10,000	10,000
Securities sold under agreements to repurchase	11,798	10,940
Excess collateral held	(1,798)	(940)
Securities sold under agreements to repurchase	10,000	10,000
1 - 3 Years
Summary of securities sold under agreements to repurchase [Abstract]
Securities sold under agreements to repurchase	0	10,000
Securities sold under agreements to repurchase	0	14,244
Excess collateral held	0	(4,244)
Securities sold under agreements to repurchase	0	10,000
3 Years
Summary of securities sold under agreements to repurchase [Abstract]
Securities sold under agreements to repurchase	0	0
Securities sold under agreements to repurchase	0	0
Excess collateral held	0	0
Securities sold under agreements to repurchase	0	0
Obligations of U.S. Government and U.S. Government sponsored enterprises
Summary of securities sold under agreements to repurchase [Abstract]
Securities sold under agreements to repurchase	0	1,276
Obligations of U.S. Government and U.S. Government sponsored enterprises | Overnight and Continuous
Summary of securities sold under agreements to repurchase [Abstract]
Securities sold under agreements to repurchase	0	0
Obligations of U.S. Government and U.S. Government sponsored enterprises | Up to 1 Year
Summary of securities sold under agreements to repurchase [Abstract]
Securities sold under agreements to repurchase	0	1,276
Obligations of U.S. Government and U.S. Government sponsored enterprises | 1 - 3 Years
Summary of securities sold under agreements to repurchase [Abstract]
Securities sold under agreements to repurchase	0	0
Obligations of U.S. Government and U.S. Government sponsored enterprises | 3 Years
Summary of securities sold under agreements to repurchase [Abstract]
Securities sold under agreements to repurchase	0	0
Mortgage-backed securities, residential
Summary of securities sold under agreements to repurchase [Abstract]
Securities sold under agreements to repurchase	11,798	37,000
Mortgage-backed securities, residential | Overnight and Continuous
Summary of securities sold under agreements to repurchase [Abstract]
Securities sold under agreements to repurchase	0	13,092
Mortgage-backed securities, residential | Up to 1 Year
Summary of securities sold under agreements to repurchase [Abstract]
Securities sold under agreements to repurchase	11,798	9,664
Mortgage-backed securities, residential | 1 - 3 Years
Summary of securities sold under agreements to repurchase [Abstract]
Securities sold under agreements to repurchase	0	14,244
Mortgage-backed securities, residential | 3 Years
Summary of securities sold under agreements to repurchase [Abstract]
Securities sold under agreements to repurchase	$ 0	$ 0