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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 | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Derivatives Fair Value [Line Items] |  |
Other Assets | $ 217,590 | $ 171,066
Accrued Liabilities And Other Liabilities | 177,889 | 129,907
Not Designated as Hedging Instrument, Economic Hedge [Member] |  |
Derivatives Fair Value [Line Items] |  |
Asset Derivative | 410 | 1,018
Liability Derivatives | 481 | 1,000
Not Designated as Hedging Instrument, Economic Hedge [Member] | Sale of TBA GNMA MBS pools [Member] |  |
Derivatives Fair Value [Line Items] |  |
Other Assets | 0 | 0
Accrued Liabilities And Other Liabilities | 387 | 383
Not Designated as Hedging Instrument, Economic Hedge [Member] | Forward loan sales commitments [Member] |  |
Derivatives Fair Value [Line Items] |  |
Other Assets | 20 | 12
Accrued Liabilities And Other Liabilities | 0 | 0
Not Designated as Hedging Instrument, Economic Hedge [Member] | Interest Rate Lock Commitments [Member] |  |
Derivatives Fair Value [Line Items] |  |
Other Assets | 294 | 383
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 | 94 | 617
Not Designated as Hedging Instrument, Economic Hedge [Member] | Interest Rate Cap [Member] | Purchase |  |
Derivatives Fair Value [Line Items] |  |
Other Assets | 96 | 623
Accrued Liabilities And Other Liabilities | $ 0 | $ 0

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