FAIR VALUE OF FINANCIAL INSTRUMENTS (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2017	Sep. 30, 2017	Sep. 30, 2016
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount			$ 0	$ 0
Impaired loans with allocated allowance for loan losses, carrying amount	$ 9,477,000	$ 8,908,000
Fair Value, Inputs, Level 3 [Member]
Impaired loans with allocated allowance for loan losses, carrying amount	3,660,000,000		3,660,000,000
Valuation allowance	366,000,000		$ 366,000,000
Increase of provision for loan loss	$ 42,000,000