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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
Mar. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Mar. 31, 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 $ 0 24,400 0 24,400 $ 37,681 $ 22,300 $ 23,000
MSRs sold $ 37,800   37,800   37,772        
Loans held-for-sale, carried at fair value   160,171     160,171   406,338    
Mortgage servicing rights                  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                  
Balance at beginning of period   42,833 76,121 48,370 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   (3,035)   (5,831) (3,079) (14,032)      
Additions   3,751   12,766 11,552 21,348      
Sales, paydowns, settlements, and other   (1,440)   (2,738) (42,485) (4,688)      
Balance at end of period   42,109 42,833 52,567 42,109 52,567      
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   66,701 58,260 26,580 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   6   95 15 142      
Additions   17,935   11,277 35,231 21,103      
Sales, paydowns, settlements, and other   (11,097)   (3,701) (19,961) (5,285)      
Balance at end of period   73,545 66,701 34,251 73,545 34,251      
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   $ 52,100 $ 66,700 $ 34,300 $ 52,100 $ 34,300 $ 58,300 $ 26,600 $ 18,300