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SERVICING RIGHTS - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended 15 Months Ended
Mar. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 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   $ 0 $ 0 $ 28,549,000 $ 39,186,000    
Unpaid principal balances of conventional agency mortgage loans       3,550,000,000      
Proceeds from sale of mortgage servicing rights       30,056,000 0    
Gain on sale of mortgage servicing rights   24,000 0 (2,426,000) 0    
Unpaid principal balance   223,600,000   223,600,000     $ 3,940,000,000
Escrow balances   479,000   479,000     17,800,000
Fair value of held-for-sale MSRs   66,000   $ 66,000     29,793,000
Discount rate       9.25%      
Prepayment speed calculation percentage       9.25%      
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 $ 37,800,000 0 $ 0 $ 0 $ 37,772,000 $ 37,772,000  
SBA              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Unpaid principal balance   $ 99,000,000   $ 99,000,000     $ 101,000,000