FAIR VALUE - Narrative (Details) - USD ($)	Sep. 30, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities, fair value disclosure, recurring	$ 0	$ 0
Impaired financing receivable, with related allowance, recorded investment	16,921,000	3,687,000
Impaired financing receivable, with related allowance, unpaid principal balance	17,142,000	3,907,000
Related allowance	3,829,000	1,654,000
Other real estate owned	453,000	1,503,000
Recorded investment of commercial real estate land loans	0	1,500,000
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired financing receivable, with related allowance, recorded investment	13,300,000	2,300,000
Impaired financing receivable, with related allowance, unpaid principal balance	17,100,000	3,900,000
Related allowance	3,800,000	$ 1,700,000
Other real estate owned	$ 453,000