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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
Jun. 30, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2016
Total gains or losses (realized/unrealized):            
MSRs sold $ 28,500,000 $ 0 $ 28,549,000 $ 39,345,000    
(Decrease) increase in GNMA loans subject to a repurchase option     (66,000,000.0)      
Disposals | Banc home loans            
Total gains or losses (realized/unrealized):            
Servicing rights carried at fair value   0 0 37,700,000 $ 0  
MSRs sold   0 0 37,772,000 37,772,000  
Loans held-for-sale, carried at fair value   0 19,490,000   19,490,000  
Disposals | Banc home loans | 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           $ 58,300,000
Recurring | Disposals | Banc home loans            
Total gains or losses (realized/unrealized):            
Loans held-for-sale, carried at fair value     19,500,000   19,500,000  
Significant Unobservable Inputs (Level 3) | Recurring | Mortgage Servicing Rights            
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]            
Beginning Balance 31,852,000 1,770,000 31,852,000 76,121,000    
Total gains or losses (realized/unrealized):            
Included in earnings-fair value adjustment   (264,000) (1,155,000) (10,240,000)    
Additions   0 0 12,127,000    
Sales and settlements   (349,000) (28,927,000) (46,156,000)    
Ending Balance   1,157,000 1,770,000 31,852,000 1,770,000  
Significant Unobservable Inputs (Level 3) | Recurring | 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 25,040,000 98,940,000 58,260,000    
Total gains or losses (realized/unrealized):            
Included in earnings-fair value adjustment   (16,000) (1,378,000) (781,000)    
Additions   406,000 23,678,000 117,215,000    
Sales and settlements   (6,197,000) (96,200,000) (75,754,000)    
Ending Balance   19,233,000 25,040,000 98,940,000 25,040,000  
Significant Unobservable Inputs (Level 3) | Recurring | Disposals | Banc home loans            
Total gains or losses (realized/unrealized):            
Loans held-for-sale, carried at fair value     17,400,000   17,400,000  
Significant Unobservable Inputs (Level 3) | Recurring | Disposals | Banc home loans | 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   $ 0 $ 17,300,000 $ 32,300,000 $ 17,300,000