SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)	12 Months Ended
	Dec. 31, 2017
CASH AND CASH EQUIVALENTS
Short term investment maturity period	12 months
ALLOWANCE FOR LOAN LOSSES
Minimum period due consumer loan	120 days
Period for measurement of loan component	60 months
Historical loss period	5 years
STOCK OPTIONS
Option vesting period	5 years
Premises | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life	15 years
Premises | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	40 years
Equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years
Equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	10 years