MERGER (Details) $ / shares in Units, shares in Thousands, $ in Millions	Feb. 01, 2021 USD ($) $ / shares shares	Jan. 31, 2021 shares	Dec. 31, 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, Series A, par value (in dollars per share)	$ 0.01		$ 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, Series A, par value (in dollars per share)	$ 0.01
Merger Agreement
MERGER
Number of Bridge Outstanding Shares | shares		41,226
Percentage Ownership		100.00%
Merger Agreement | Bridge shareholders
MERGER
Number of Bridge Outstanding Shares | shares	21,200	19,993
Percentage Ownership	51.50%	48.50%
Merger Agreement | Legacy Dime shareholders
MERGER
Number of Bridge Outstanding Shares | shares	30,853	21,233
Percentage Ownership		51.50%