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VARIABLE INTEREST ENTITIES - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Variable Interest Entity [Line Items]
Total assets	$ 8,027,413			$ 8,027,413		$ 7,877,334
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Funding transferred	0	$ 0		0	$ 3,631
Total assets	247,571			247,571		251,713
Maximum loss exposure	24,068			24,068		27,977
Variable Interest Entity, Not Primary Beneficiary | Other Assets
Variable Interest Entity [Line Items]
Total assets	$ 24,100			$ 24,100		$ 28,000
Variable Interest Entity, Not Primary Beneficiary | Multifamily
Variable Interest Entity [Line Items]
Funding transferred			$ 573,500
Credit losses guaranteed (percent)	12.00%			12.00%
Repurchase liability recognized	$ 3,600			$ 3,600
Maximum loss exposure	$ 68,800			$ 68,800

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