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CONTINGENCIES (Details)
$ in Millions
1 Months Ended
Jul. 09, 2015
USD ($)
Feb. 29, 2016
loan
defendant
Dec. 31, 2013
claim
network_lender
Sep. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Contingencies          
Accrued litigation liability       $ 0.1 $ 0.3
Pending litigation or appeal | Residential Funding Company          
Contingencies          
Accrued litigation liability       7.0  
Number of loan originators | network_lender     80    
Number of asserted claims | claim     2    
Damages sought $ 44.0        
Pending litigation or appeal | Lehman Brothers Holdings, Inc. Demand Letter          
Contingencies          
Accrued litigation liability       1.0  
Number of defendants | defendant   149      
Number of loans | loan   64      
Discontinued Operations, Disposed of by Sale          
Contingencies          
Accrued litigation liability       $ 8.0 $ 4.0