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RISK MANAGEMENT AND DERIVATIVE INSTRUMENTS - Additional Information (Detail) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Net Revenue on Mortgage Banking Activities          
Derivative [Line Items]          
Derivatives gain (loss) $ 0 $ (5,500,000) $ (2,700,000) $ (9,100,000)  
Loan Origination Commitments          
Derivative [Line Items]          
Committed fund loans for borrowers 398,700,000   398,700,000    
Other Assets          
Derivative [Line Items]          
Derivatives asset, fair values 11,800,000   11,800,000   $ 6,379,000
Accrued Expenses and Other Liabilities          
Derivative [Line Items]          
Derivatives liability, fair values (557,000)   (557,000)   (3,235,000)
Bank forward commitments outstanding 46,537,000   $ 46,537,000   424,904,000
California | Geographic Concentration Risk | Properties Securing Loans Held for Sale          
Derivative [Line Items]          
Concentration risk percentage     82.80%    
Interest Rate Swap Maturing on September 27, 2018 | Cash Flow Hedging          
Derivative [Line Items]          
Derivatives, notional amount   50,000,000   50,000,000  
Interest Rate Swap Maturing on January 30, 2022 | Cash Flow Hedging          
Derivative [Line Items]          
Derivatives, notional amount   $ 25,000,000   $ 25,000,000  
Interest rate swap          
Derivative [Line Items]          
Derivatives asset, fair values 166,000   $ 166,000    
Interest rate swap | Other Assets          
Derivative [Line Items]          
Derivatives asset, fair values 431,000   431,000   0
Interest rate swap | Accrued Expenses and Other Liabilities          
Derivative [Line Items]          
Derivatives liability, fair values (265,000)   (265,000)   (235,000)
Bank forward commitments outstanding 25,000,000   25,000,000   50,000,000
Interest Rate Lock Commitment and Forward Contracts | Not Designated as Hedging Instrument | Other Assets          
Derivative [Line Items]          
Derivatives asset, fair values 11,400,000   11,400,000    
Interest Rate Lock Commitment and Forward Contracts | Not Designated as Hedging Instrument | Accrued Expenses and Other Liabilities          
Derivative [Line Items]          
Derivatives liability, fair values (292,000)   (292,000)    
Mandatory forward commitments | Other Assets          
Derivative [Line Items]          
Derivatives asset, fair values 1,872,000   1,872,000   629,000
Mandatory forward commitments | Accrued Expenses and Other Liabilities          
Derivative [Line Items]          
Derivatives liability, fair values 0   0   (2,803,000)
Bank forward commitments outstanding 0   0   $ 364,829,000
Mandatory forward commitments | Not Designated as Hedging Instrument          
Derivative [Line Items]          
Bank forward commitments outstanding $ 562,000,000   $ 562,000,000