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RISK MANAGEMENT AND DERIVATIVE INSTRUMENTS - Additional Information (Detail) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Net Revenue on Mortgage Banking Activities          
Derivative [Line Items]          
Derivatives gain (loss) $ (2,700,000) $ (2,500,000) $ (5,400,000) $ (11,600,000)  
Loan Origination Commitments          
Derivative [Line Items]          
Committed fund loans for borrowers 309,200,000   309,200,000    
Other Assets          
Derivative [Line Items]          
Derivatives asset, fair values 9,748,000   9,748,000   $ 6,379,000
Accrued Expenses and Other Liabilities          
Derivative [Line Items]          
Derivatives liability, fair values (5,873,000)   (5,873,000)   (3,235,000)
Bank forward commitments outstanding 570,455,000   $ 570,455,000   424,904,000
California | Geographic Concentration Risk | Properties Securing Loans Held for Sale          
Derivative [Line Items]          
Concentration risk percentage     76.30%    
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 (918,000)   $ (918,000)    
Interest rate swap | Other Assets          
Derivative [Line Items]          
Derivatives asset, fair values 27,000   27,000   0
Interest rate swap | Accrued Expenses and Other Liabilities          
Derivative [Line Items]          
Derivatives liability, fair values (945,000)   (945,000)   (235,000)
Bank forward commitments outstanding 50,000,000   50,000,000   50,000,000
Interest Rate Lock Commitment and Forward Contracts | Not Designated as Hedging Instrument | Other Assets          
Derivative [Line Items]          
Derivatives asset, fair values 9,700,000   9,700,000    
Interest Rate Lock Commitment and Forward Contracts | Not Designated as Hedging Instrument | Accrued Expenses and Other Liabilities          
Derivative [Line Items]          
Derivatives liability, fair values (4,900,000)   (4,900,000)    
Mandatory forward commitments | Other Assets          
Derivative [Line Items]          
Derivatives asset, fair values 0   0   629,000
Mandatory forward commitments | Accrued Expenses and Other Liabilities          
Derivative [Line Items]          
Derivatives liability, fair values (4,820,000)   (4,820,000)   (2,803,000)
Bank forward commitments outstanding 517,000,000   517,000,000   $ 364,829,000
Mandatory forward commitments | Not Designated as Hedging Instrument          
Derivative [Line Items]          
Bank forward commitments outstanding $ 517,000,000   $ 517,000,000