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MERGER (Details)
$ / shares in Units, $ in Millions
Feb. 01, 2021
USD ($)
$ / shares
shares
Jan. 31, 2021
shares
Jun. 30, 2021
$ / shares
Dec. 31, 2020
$ / shares
Sep. 30, 2015
USD ($)
MERGER          
Common stock, par value (in dollars per share) $ 0.01   $ 0.01 $ 0.01  
Share conversion ratio 0.6480        
Preferred stock, par value (in dollars per share)     $ 0.01 $ 0.01  
Aggregate principal amount | $         $ 80.0
Preferred Stock          
MERGER          
Share conversion ratio 1        
Legacy Dime          
MERGER          
Common stock, par value (in dollars per share) $ 0.01        
Aggregate principal amount | $ $ 115.0        
Fixed interest rate of debentures 4.50%        
Legacy Dime | Preferred Stock          
MERGER          
Preferred stock, par value (in dollars per share) $ 0.01        
Merger Agreement          
MERGER          
Number of Bridge Outstanding Shares | shares   41,226,000      
Percentage Ownership   100.00%      
Merger Agreement | Bridge shareholders          
MERGER          
Number of Bridge Outstanding Shares | shares 21,200,000 19,993,000      
Percentage Ownership 51.50% 48.50%      
Merger Agreement | Legacy Dime shareholders          
MERGER          
Number of Bridge Outstanding Shares | shares 30,853,000 21,233,000      
Percentage Ownership   51.50%