FHLBNY ADVANCES - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
FHLBNY advances with an overnight contractual maturity	$ 175.0		$ 175.0		$ 0
Federal Home Loan Bank of New York
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Borrowings total	$ 1,450,000,000		$ 1,450,000,000		$ 1,130,000,000
Average interest rate on outstanding FHLBNY	5.14%		5.14%		4.55%
Borrowings	$ 4,140,000,000		$ 4,140,000,000		$ 4,130,000,000
Callable advances	0		0
Extinguishment of debt	$ 0	$ 0	$ 0	$ 0