FHLBNY ADVANCES - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
FHLBNY ADVANCES
Extinguishment of FHLBNY	$ 1,751,000	$ 1,104,000	$ 3,780,000
Borrowings total	$ 25,000,000.0	$ 1,200,000,000
Average interest rate on outstanding FHLBNY	0.35%	0.53%
Borrowings	$ 4,190,000,000	$ 2,110,000,000
Callable advances	0
FHLBNY advances with an overnight contractual maturity	0	0
FHLBNY advances with contractual maturities after 2022	$ 0	$ 0