FAIR VALUE - IMPAIRED LOANS (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Dec. 31, 2016
Impaired loans
Carrying amount of loans measured at fair value	$ 28,300		$ 28,300	$ 31,268
Valuation allowance	(4,584)		(4,584)	(4,925)
Nonrecurring basis
Impaired loans
Total fair value	7,349		7,349	7,864
Fair Value, Inputs, Level 3 | Nonrecurring basis
Impaired loans
Carrying amount of loans measured at fair value	6,576		6,576	6,963
Estimated selling costs considered in carrying amount	862		862	936
Valuation allowance	(89)		(89)	(35)
Total fair value	7,349		7,349	7,864
Provision for impairment on loan, lease and other losses
Provisions on collateral-dependent, impaired loans	$ 59	$ (16)	$ 281	$ (40)