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FAIR VALUES OF FINANCIAL INSTRUMENTS - Reconciliation of Assets Measured at Fair Value on Recurring Basis (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
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Total gains or losses (realized/unrealized):                    
MSRs sold   $ 2,570 $ 0 $ 28,549 $ 39,186          
Discontinued Operations, Disposed of by Sale | Banc Home Loan                    
Total gains or losses (realized/unrealized):                    
Servicing rights carried at fair value     0   0     $ 37,700    
MSRs sold $ 37,800 0 0 0 37,772 $ 37,772        
Loans held-for-sale, carried at fair value   26,415   26,415   26,415   38,696    
Mortgage servicing rights                    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                    
Balance at beginning of period   4,953 42,833 31,852 76,121          
Transfers in and (out) of Level 3   0 0 0 0          
Total gains or losses (realized/unrealized):                    
Included in earnings—fair value adjustment   (216) (3,035) (1,090) (3,079)          
Additions   0 3,751 0 11,552          
Sales, paydowns, settlements, and other   (2,675) (1,440) (28,700) (42,485)          
Balance at end of period   2,062 42,109 2,062 42,109 2,062        
U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities                    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                    
Balance at beginning of period   42,962 66,701 98,940 58,260          
Transfers in and (out) of Level 3   0 0 0 0          
Total gains or losses (realized/unrealized):                    
Included in earnings—fair value adjustment   (248) 6 (254) 15          
Additions   2,765 17,935 27,385 35,231          
Sales, paydowns, settlements, and other   (12,245) (11,097) (92,837) (19,961)          
Balance at end of period   33,234 73,545 33,234 73,545 33,234        
U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities | Discontinued Operations, Disposed of by Sale | Banc Home Loan                    
Total gains or losses (realized/unrealized):                    
Loans held-for-sale, carried at fair value   $ 20,900 $ 52,100 $ 20,900 $ 52,100 $ 20,900 $ 24,000 $ 32,300 $ 66,700 $ 58,300