FAIR VALUE - RECURRING LEVEL 3 MEASUREMENTS (Details) $ in Thousands	Sep. 30, 2018 USD ($) item	Dec. 31, 2017 USD ($) item	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)
Fair value inputs quantitative information
Consumer loans held for investment	$ 2,097
Aggregate fair value of consumer loan		$ 2,677	$ 3,368	$ 3,235	$ 2,198
Recurring basis
Fair value inputs quantitative information
Consumer loans held for investment	2,097
Aggregate fair value of consumer loan		2,677
Recurring basis | Fair Value, Inputs, Level 3
Fair value inputs quantitative information
Consumer loans held for investment	2,097
Aggregate fair value of consumer loan		2,677
Private label mortgage backed security | Recurring basis | Fair Value, Inputs, Level 3
Fair value inputs quantitative information
Mortgage backed security fair value	$ 3,849	$ 4,449
Valuation technique	us-gaap:ValuationTechniqueDiscountedCashFlowMember	us-gaap:ValuationTechniqueDiscountedCashFlowMember
Private label mortgage backed security | Minimum | Recurring basis | Constant Prepayment Rate | Fair Value, Inputs, Level 3
Fair value inputs quantitative information
Measurable input percentage	2.0	3.5
Private label mortgage backed security | Minimum | Recurring basis | Probability of default | Fair Value, Inputs, Level 3
Fair value inputs quantitative information
Measurable input percentage | item	1.8	1.8
Private label mortgage backed security | Minimum | Recurring basis | Loss Severity | Fair Value, Inputs, Level 3
Fair value inputs quantitative information
Measurable input percentage | item	50	60
Private label mortgage backed security | Maximum | Recurring basis | Constant Prepayment Rate | Fair Value, Inputs, Level 3
Fair value inputs quantitative information
Measurable input percentage	9.0	6.5
Private label mortgage backed security | Maximum | Recurring basis | Probability of default | Fair Value, Inputs, Level 3
Fair value inputs quantitative information
Measurable input percentage | item	4.0	8.0
Private label mortgage backed security | Maximum | Recurring basis | Loss Severity | Fair Value, Inputs, Level 3
Fair value inputs quantitative information
Measurable input percentage | item	85	85
Consumer loans
Fair value inputs quantitative information
Consumer loans held for investment	$ 2,097
Aggregate fair value of consumer loan		$ 2,677
Consumer loans | Recurring basis | Fair Value, Inputs, Level 3
Fair value inputs quantitative information
Consumer loans held for investment	$ 2,097
Aggregate fair value of consumer loan		$ 2,677
Valuation technique	us-gaap:ValuationTechniqueDiscountedCashFlowMember	us-gaap:MarketApproachValuationTechniqueMember
Consumer loans | Recurring basis | Constant Prepayment Rate | Fair Value, Inputs, Level 3
Fair value inputs quantitative information
Measurable input percentage | item	15.0
Consumer loans | Recurring basis | Probability of default | Fair Value, Inputs, Level 3
Fair value inputs quantitative information
Measurable input percentage | item	45.0
Consumer loans | Recurring basis | Loss Severity | Fair Value, Inputs, Level 3
Fair value inputs quantitative information
Measurable input percentage | item	11.50
Consumer loans | Recurring basis | Discount Rate | Fair Value, Inputs, Level 3
Fair value inputs quantitative information
Measurable input percentage | item		5.0
Consumer loans | Recurring basis | Net Premium | Fair Value, Inputs, Level 3
Fair value inputs quantitative information
Measurable input percentage | item		0.9