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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, 2020
Dec. 31, 2019
Derivatives Fair Value [Line Items]    
Other Assets $ 414,217 $ 177,842
Accrued Liabilities And Other Liabilities 257,826 180,614
Not Designated as Hedging Instrument, Economic Hedge [Member]    
Derivatives Fair Value [Line Items]    
Asset Derivative 3,098 372
Liability Derivatives 1,821 149
Not Designated as Hedging Instrument, Economic Hedge [Member] | Interest Rate Swap [Member]    
Derivatives Fair Value [Line Items]    
Other Assets 1,762 0
Accrued Liabilities And Other Liabilities 1,789 0
Not Designated as Hedging Instrument, Economic Hedge [Member] | Sale of TBA GNMA MBS pools [Member]    
Derivatives Fair Value [Line Items]    
Other Assets 364 0
Accrued Liabilities And Other Liabilities 31 138
Not Designated as Hedging Instrument, Economic Hedge [Member] | Forward loan sales commitments [Member]    
Derivatives Fair Value [Line Items]    
Other Assets 20 20
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 951 341
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 1 11
Not Designated as Hedging Instrument, Economic Hedge [Member] | Interest Rate Cap [Member] | Purchase    
Derivatives Fair Value [Line Items]    
Other Assets 1 11
Accrued Liabilities And Other Liabilities $ 0 $ 0