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SALES OF BRANCH, SUBSIDIARY AND BUSINESS UNITS - Net Gain on Disposal of Discontinued Operations (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Net cash proceeds   $ 56,123 $ 246,957 $ 0
Book value of MSRs sold   (39,345) (5,382) (5,862)
Net gain on disposal of discontinued operations   13,796 0 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 sale of business unit   63,054    
Compensation expense related to the transaction   (3,500)    
Other transaction costs   (3,431)    
Net cash proceeds   56,123    
Book value of certain assets sold $ (2,500) (2,455)    
Book value of MSRs sold (37,800) (37,772)    
Goodwill   0 (2,100)  
Net gain on disposal of discontinued operations $ 13,800 $ 13,796 $ 0 $ 0