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SALE OF BUSINESS UNIT (DISCONTINUED OPERATIONS) - Summary of net gain on disposal of discontinued operations (Details) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended 15 Months Ended
Mar. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Mar. 31, 2018
Jun. 30, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Net cash proceeds       $ 0 $ 56,076,000    
Book value of MSRs sold   $ 0 $ 0 (28,549,000) (39,186,000)    
Net gain on disposal   0 211,000 1,275,000 13,749,000    
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   0 (14,000) 0 63,054,000   $ 63,054,000
Compensation expense related to the transaction   0 0 1,003,000 (3,500,000)   (2,497,000)
Other transaction costs   0 225,000 272,000 (3,478,000)   (3,159,000)
Net cash proceeds   0 211,000 1,275,000 56,076,000   57,398,000
Book value of certain assets sold $ (2,500,000) 0 (2,455,000) 0 (2,455,000)    
Book value of MSRs sold $ (37,800,000) 0 0 0 (37,772,000)   (37,772,000)
Goodwill   0 (2,100,000) 0 (2,100,000)    
Net gain on disposal   $ 0 $ 211,000 $ 1,275,000 $ 13,749,000 $ 15,100,000 $ 15,071,000