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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Purchases and Sales Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Jun. 30, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Premium on loans and leases purchased	$ 17,500	$ 4,700	$ 0
Transfers to loans held for sale	15,206	0	1,139,597
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	$ 0	$ 0	752,087
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
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Combined notional value				$ 543,400

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