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SALES OF SUBSIDIARY AND BUSINESS UNITS - Summary of net gain on disposal of discontinued operations (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Mar. 30, 2017
Sep. 30, 2017
Mar. 31, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Net cash proceeds         $ 56,076 $ 0  
Book value of MSRs sold   $ 0   $ 0 (39,186) (3)  
Net gain on disposal         13,749 0  
Banc Home Loan | Discontinued Operations, Disposed of by Sale              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Proceeds from the transaction         63,054    
Compensation expense related to the transaction         (3,500)    
Other transaction costs         (3,478)    
Net cash proceeds         56,076    
Book value of certain assets sold $ (2,500) (2,455)     (2,455)    
Book value of MSRs sold (37,800)   $ (37,800)   (37,772)    
Goodwill   0     0   $ (2,100)
Net gain on disposal $ 13,700 $ 211   $ 0 $ 13,749 $ 0