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FEDERAL HOME LOAN BANK ADVANCES - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]      
Advances collateralized amount $ 3,800.0   $ 2,200.0
Maximum borrowing amount from FHLB term advances 3,900.0    
FHLB advances with contractual maturities after 2022 0.0    
Legacy Dime      
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]      
FHLB advances 216.3    
Prepayments penalty expenses 1.6 $ 0.0  
Extinguishment of FHLB $ 130.2    
Weighted average rate 1.91%