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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, 2021 | Dec. 31, 2020
--- | --- | ---
Derivatives Fair Value [Line Items] |  |
Other Assets | $ 251,791 | $ 272,737
Accounts payable and other liabilities | 269,769 | 276,747
Not Designated as Hedging Instrument, Economic Hedge [Member] |  |
Derivatives Fair Value [Line Items] |  |
Asset Derivative | 1,770 | 2,482
Liability Derivatives | 1,227 | 1,920
Not Designated as Hedging Instrument, Economic Hedge [Member] | Sale of TBA GNMA MBS pools [Member] |  |
Derivatives Fair Value [Line Items] |  |
Other Assets | 44 | 102
Accounts payable and other liabilities | 11 | 280
Not Designated as Hedging Instrument, Economic Hedge [Member] | Loan Origination Commitments [Member] |  |
Derivatives Fair Value [Line Items] |  |
Other Assets | 20 | 20
Accounts payable 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 | 485 | 737
Accounts payable 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
Accounts payable and other liabilities | 3 | 1
Not Designated as Hedging Instrument, Economic Hedge [Member] | Interest Rate Cap [Member] | Purchase |  |
Derivatives Fair Value [Line Items] |  |
Other Assets | 3 | 1
Accounts payable and other liabilities | 0 | 0
Not Designated as Hedging Instrument, Economic Hedge [Member] | Interest Rate Swap [Member] |  |
Derivatives Fair Value [Line Items] |  |
Asset Derivative | 1,218 | 1,622
Liability Derivatives | $ 1,213 | $ 1,639

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