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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