FAIR VALUE MEASUREMENTS, Key Methods and Assumptions Used (Details) - Collateral, Market, Income, Enterprise, Liquidation and Discounted Cash Flows [Member] - Selling Costs [Member]	Jun. 30, 2018	Dec. 31, 2017
Minimum [Member]
Key methods and assumptions used in measuring fair value of impaired loans [Abstract]
Impaired loans, measurement input	0.06	0.06
Maximum [Member]
Key methods and assumptions used in measuring fair value of impaired loans [Abstract]
Impaired loans, measurement input	0.07	0.07