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FAIR VALUES OF FINANCIAL INSTRUMENTS - Reconciliation of Assets Measured at Fair Value on Recurring Basis (Detail) - Recurring - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Dec. 31, 2017
Discontinued Operations, Disposed of by Sale | Banc Home Loan                
Total gains or losses (realized/unrealized):                
Loans held-for-sale, carried at fair value           $ 19,500,000    
Significant Unobservable Inputs (Level 3) | Discontinued Operations, Disposed of by Sale | Banc Home Loan                
Total gains or losses (realized/unrealized):                
Loans held-for-sale, carried at fair value           17,400,000    
Significant Unobservable Inputs (Level 3) | 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 $ 21,075,000 $ 33,234,000 $ 25,040,000 $ 98,940,000        
Total gains or losses (realized/unrealized):                
Included in earnings—fair value adjustment 2,000 (22,000) (1,000) (276,000)        
Additions 406,000 711,000 406,000 28,096,000        
Sales, paydowns, settlements, and other (978,000) (8,167,000) (4,940,000) (101,004,000)        
Balance at end of period 20,505,000 25,756,000 20,505,000 25,756,000        
Significant Unobservable Inputs (Level 3) | 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 $ 0 $ 17,700,000 $ 0 $ 17,700,000 $ 0 $ 17,300,000 $ 20,900,000 $ 32,300,000