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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 9 Months Ended
Mar. 30, 2017
Sep. 30, 2017
Mar. 31, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2016
Dec. 31, 2015
Total gains or losses (realized/unrealized):                    
MSRs sold   $ 0   $ 0 $ 39,186 $ 3        
Discontinued Operations, Disposed of by Sale | Banc Home Loan                    
Total gains or losses (realized/unrealized):                    
Servicing rights carried at fair value   0   30,800 0 30,800 $ 0 $ 37,681 $ 24,400 $ 23,000
MSRs sold $ 37,800   $ 37,800   37,772          
Loans held-for-sale, carried at fair value   58,954     58,954     406,338    
Mortgage servicing rights                    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                    
Balance at beginning of period   42,109 76,121 52,567 76,121 49,939        
Transfers in and (out) of Level 3   0   0 0 0        
Total gains or losses (realized/unrealized):                    
Included in earnings—fair value adjustment   (1,905)   (465) (4,984) (14,497)        
Additions   574   14,300 12,126 35,648        
Sales, paydowns, settlements, and other   (2,063)   (3,726) (44,548) (8,414)        
Balance at end of period   38,715   62,676 38,715 62,676        
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   73,545 $ 58,260 34,251 58,260 18,291        
Transfers in and (out) of Level 3   0   0 0 0        
Total gains or losses (realized/unrealized):                    
Included in earnings—fair value adjustment   (809)   (21) (794) 121        
Additions   24,537   14,445 59,768 35,548        
Sales, paydowns, settlements, and other   (12,909)   (1,027) (32,870) (6,312)        
Balance at end of period   84,364   47,648 84,364 47,648        
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   $ 41,200   $ 47,600 $ 41,200 $ 47,600 $ 52,100 $ 58,300 $ 34,300 $ 18,300