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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Summary of Fair Value of Derivative Instruments and Location in Statement of Financial Condition (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Derivatives Fair Value [Line Items] |  |
Other Assets | $ 442,806 | $ 461,491
Accrued Liabilities And Other Liabilities | 159,892 | 145,905
Not Designated as Hedging Instrument, Economic Hedge [Member] |  |
Derivatives Fair Value [Line Items] |  |
Other Assets | 931 | 312
Accrued Liabilities And Other Liabilities | 835 | 324
Not Designated as Hedging Instrument, Economic Hedge [Member] | Forward Contracts [Member] |  |
Derivatives Fair Value [Line Items] |  |
Other Assets | 116 | 7
Accrued Liabilities And Other Liabilities | 20 | 19
Not Designated as Hedging Instrument, Economic Hedge [Member] | Loan Origination Commitments [Member] |  |
Derivatives Fair Value [Line Items] |  |
Other Assets | 0 | 0
Accrued Liabilities And Other Liabilities | 0 | 0
Not Designated as Hedging Instrument, Economic Hedge [Member] | Interest Rate Cap [Member] | Written |  |
Derivatives Fair Value [Line Items] |  |
Other Assets | 0 | 0
Accrued Liabilities And Other Liabilities | 815 | 305
Not Designated as Hedging Instrument, Economic Hedge [Member] | Interest Rate Cap [Member] | Purchase |  |
Derivatives Fair Value [Line Items] |  |
Other Assets | 815 | 305
Accrued Liabilities And Other Liabilities | $ 0 | $ 0

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