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FEDERAL HOME LOAN BANK OF NEW YORK ADVANCES - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Feb. 01, 2021
Dec. 31, 2020
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]          
Advances collateralized amount   $ 4,250,000,000     $ 2,150,000,000
Maximum borrowing amount from FHLBNY term advances   3,710,000,000      
FHLBNY advances with contractual maturities after 2021   0     0
FHLBNY advances with an overnight contractual maturity   0     $ 0
Prepayments penalty expenses $ 0 1,800,000 $ 0    
Legacy Dime          
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]          
FHLBNY advances       $ 216,300,000  
Extinguishment of FHLBNY   $ 209,000,000.0      
Weighted average rate   1.31%