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FAIR VALUES OF FINANCIAL INSTRUMENTS - Reconciliation of Assets Measured at Fair Value on Recurring Basis (Details) - USD ($)
 6 Months Ended 12 Months Ended 21 Months Ended
Mar. 30, 2017
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2018
Dec. 31, 2015
Dec. 31, 2014
Total gains or losses (realized/unrealized):                
MSRs sold   $ 28,500,000 $ 28,549,000 $ 39,345,000 $ 5,382,000      
Mortgage Servicing Rights                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Beginning Balance   31,852,000 31,852,000 76,121,000 49,939,000      
Total gains or losses (realized/unrealized):                
Included in earnings-fair value adjustment     (1,155,000) (10,240,000) (5,709,000)      
Additions     0 12,127,000 49,293,000      
Sales and settlements     (28,927,000) (46,156,000) (17,402,000)      
Ending Balance     1,770,000 31,852,000 76,121,000 $ 1,770,000    
Loans Repurchased or eligible to be repurchased from Ginnie Mae Loan Pools                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Beginning Balance   $ 98,940,000 98,940,000 58,260,000 18,291,000      
Total gains or losses (realized/unrealized):                
Included in earnings-fair value adjustment     (1,378,000) (781,000) 216,000      
Additions     23,678,000 117,215,000 51,123,000      
Sales and settlements     (96,200,000) (75,754,000) (11,370,000)      
Ending Balance     25,040,000 98,940,000 58,260,000 25,040,000    
Discontinued Operations, Disposed of by Sale | Banc Home Loan                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Servicing rights carried at fair value     0 0 37,700,000 0 $ 22,900,000  
Total gains or losses (realized/unrealized):                
MSRs sold $ 37,800,000   28,500,000 37,772,000   37,772,000    
Loans held-for-sale, carried at fair value     19,490,000 38,696,000   19,490,000    
Discontinued Operations, Disposed of by Sale | Banc Home Loan | Loans Repurchased or eligible to be repurchased from Ginnie Mae Loan Pools                
Total gains or losses (realized/unrealized):                
Loans held-for-sale, carried at fair value     $ 17,300,000 $ 32,300,000 $ 58,300,000 $ 17,300,000   $ 18,300,000