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, 2020	Dec. 31, 2019
Derivatives Fair Value [Line Items]
Other Assets	$ 206,789	$ 213,513
Accrued Liabilities And Other Liabilities	210,736	180,614
Not Designated as Hedging Instrument, Economic Hedge [Member]
Derivatives Fair Value [Line Items]
Asset Derivative	1,041	372
Liability Derivatives	201	149
Not Designated as Hedging Instrument, Economic Hedge [Member] | Sale of TBA GNMA MBS pools [Member]
Derivatives Fair Value [Line Items]
Other Assets	58	0
Accrued Liabilities And Other Liabilities	192	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	954	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	9	11
Not Designated as Hedging Instrument, Economic Hedge [Member] | Interest Rate Cap [Member] | Purchase
Derivatives Fair Value [Line Items]
Other Assets	9	11
Accrued Liabilities And Other Liabilities	$ 0	$ 0