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FAIR VALUE - RECURRING LEVEL 3 MEASUREMENTS (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Fair value inputs quantitative information        
Aggregate fair value of consumer loan $ 2,419 $ 2,677 $ 3,679 $ 2,198
Fair Value, Inputs, Level 3        
Fair value inputs quantitative information        
Aggregate fair value of consumer loan 2,419 2,677    
Recurring basis        
Fair value inputs quantitative information        
Aggregate fair value of consumer loan 2,419 2,677    
Recurring basis | Fair Value, Inputs, Level 3        
Fair value inputs quantitative information        
Aggregate fair value of consumer loan 2,419 2,677    
Consumer Loans Held For Sale        
Fair value inputs quantitative information        
Aggregate fair value of consumer loan 2,419 2,677    
Consumer Loans Held For Sale | Recurring basis | Fair Value, Inputs, Level 3        
Fair value inputs quantitative information        
Aggregate fair value of consumer loan $ 2,419 $ 2,677    
Consumer Loans Held For Sale | Contractual Terms | Recurring basis | Fair Value, Inputs, Level 3        
Fair value inputs quantitative information        
Net Premium (as a percent) 0.90% 0.90%    
Discount rate (as a percent) 5.00% 5.00%    
Private label mortgage backed security | Recurring basis | Fair Value, Inputs, Level 3        
Fair value inputs quantitative information        
Mortgage backed security fair value $ 4,120 $ 4,449    
Private label mortgage backed security | Discounted cash flow | Minimum | Recurring basis | Fair Value, Inputs, Level 3        
Fair value inputs quantitative information        
Constant prepayment rate (as a percent) 5.00% 3.50%    
Probability of default (as a percent) 1.80% 1.80%    
Loss severity (as a percent) 50.00% 60.00%    
Private label mortgage backed security | Discounted cash flow | Maximum | Recurring basis | Fair Value, Inputs, Level 3        
Fair value inputs quantitative information        
Constant prepayment rate (as a percent) 6.50% 6.50%    
Probability of default (as a percent) 8.00% 8.00%    
Loss severity (as a percent) 85.00% 85.00%