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LOANS AND ALLOWANCE FOR LOAN LOSSES - Purchases and Sales Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jun. 30, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Premium on loans and leases purchased		$ 2,300
Transfers to loans held for sale	$ 1,139,597	376,995	$ 465,854
Realized loss on derivatives	9,000
Gain on securitization	8,900
Multifamily | Commercial
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Transfers to loans held for sale	752,087	$ 81,449	$ 6,583
Multifamily | Federal Home Loan Mortgage Corporation | Commercial
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Transfers to loans held for sale	$ 573,900
Weighted average coupon rate (percent)	3.79%
Weighted average term to initial reset	3 years 6 months
Interest rate swaps and caps on loans
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Combined notional value				$ 543,400

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