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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
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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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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