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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 |  |

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