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SUBSEQUENT EVENT (Details) $ / shares in Units, $ in Millions	Feb. 01, 2021 USD ($) $ / shares shares	Dec. 31, 2020 $ / shares shares	Dec. 31, 2019 $ / shares shares	Sep. 30, 2015 USD ($)
Subsequent Event [Line Items]
Common stock, par value (in dollars per share)		$ 0.01	$ 0.01
Common stock issued to Legacy Dime shareholders in connection with the Merger | shares		19,951,955	19,898,022
Preferred stock, par value (in dollars per share)		$ 0.01	$ 0.01
Preferred stock, shares issued | shares		0	0
Aggregate principal amount of 4.50% Fixed-to-Floating Rate Debentures due 2027 | $				$ 80.0
Subsequent Event
Subsequent Event [Line Items]
Common stock, par value (in dollars per share)	$ 0.01
Share conversion ratio	0.6480
Subsequent Event | Legacy Dime
Subsequent Event [Line Items]
Common stock, par value (in dollars per share)	$ 0.01
Common stock issued to Legacy Dime shareholders in connection with the Merger | shares	21,232,920
Preferred stock, par value (in dollars per share)	$ 0.01
Subsequent Event | Subordinated Debentures | Legacy Dime
Subsequent Event [Line Items]
Aggregate principal amount of 4.50% Fixed-to-Floating Rate Debentures due 2027 | $	$ 115.0
Fixed interest rate of debentures	4.50%
Preferred Stock | Subsequent Event
Subsequent Event [Line Items]
Share conversion ratio	1
Non-Cumulative Perpetual Preferred Stock, Series A | Subsequent Event
Subsequent Event [Line Items]
Preferred stock, shares issued | shares	5,299,200
Preferred stock fixed-rate	5.50%

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