FHLBNY ADVANCES - Narrative (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2023	Dec. 31, 2022
FHLBNY ADVANCES
Borrowings total	$ 1,500,000,000	$ 1,130,000,000
Average interest rate on outstanding FHLBNY	5.04%	4.55%
Borrowings	$ 4,450,000,000	$ 4,130,000,000
Callable advances	0
Extinguishment of debt	0	0
FHLBNY advances with an overnight contractual maturity	$ 0	$ 0