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SERVICING RIGHTS - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 15 Months Ended
Mar. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
MSRs sold   $ 2,570 $ 0 $ 28,549 $ 39,186    
Unpaid principal balances of conventional agency mortgage loans   334,100   3,550,000      
Proceeds from sale of mortgage servicing rights   2,700   30,056 0    
Loss on sale of mortgage servicing rights   155 0 2,450 0    
Unpaid principal balance   233,200   233,200   $ 233,200 $ 3,940,000
Escrow balances   367   367   367 17,800
Fair value of held-for-sale MSRs   70   $ 70   70 29,793
Discount rate       9.00%      
Prepayment speed calculation percentage       9.00%      
Banc Home Loan | Discontinued Operations, Disposed of by Sale              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
MSRs sold $ 37,800 0 $ 0 $ 0 $ 37,772 37,772  
SBA              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Unpaid principal balance   $ 100,700   $ 100,700   $ 100,700 $ 101,000