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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 12 Months Ended
Mar. 30, 2017
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Total gains or losses (realized/unrealized):            
MSRs sold   $ 25,979 $ 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 $ 0 $ 0 $ 37,700
MSRs sold $ 37,800 0 37,772 37,772    
Loans held-for-sale, carried at fair value   29,888   29,888 38,696  
Mortgage servicing rights            
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]            
Balance at beginning of period   31,852 76,121      
Transfers in and (out) of Level 3   0 0      
Total gains or losses (realized/unrealized):            
Included in earnings—fair value adjustment   (874) (44)      
Additions   0 7,801      
Sales, paydowns, settlements, and other   (26,025) (41,045)      
Balance at end of period   4,953 42,833 4,953    
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   98,940 58,260      
Transfers in and (out) of Level 3   0 0      
Total gains or losses (realized/unrealized):            
Included in earnings—fair value adjustment   (6) 9      
Additions   24,620 17,296      
Sales, paydowns, settlements, and other   (80,592) (8,864)      
Balance at end of period   42,962 66,701 42,962    
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   $ 24,000 $ 66,700 $ 24,000 $ 32,300 $ 58,300