CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (UNAUDITED) - USD ($) $ in Thousands	Preferred Stock Cumulative Effect, Period of Adoption, Adjusted Balance	Preferred Stock	Common Stock Cumulative Effect, Period of Adoption, Adjusted Balance	Common Stock	Additional Paid-in Capital Cumulative Effect, Period of Adoption, Adjusted Balance	Additional Paid-in Capital	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Retained Earnings Cumulative Effect, Period of Adoption, Adjusted Balance	Retained Earnings	Accumulated Other Comprehensive Income (Loss) Cumulative Effect, Period of Adoption, Adjusted Balance	Accumulated Other Comprehensive Income (Loss)	Unearned Equity Awards	Common Stock Held by BMP Cumulative Effect, Period of Adoption, Adjusted Balance	Common Stock Held by BMP	Treasury Stock, at Cost Cumulative Effect, Period of Adoption, Adjusted Balance	Treasury Stock, at Cost	Cumulative Effect, Period of Adoption, Adjustment	Cumulative Effect, Period of Adoption, Adjusted Balance	Total
Balance at Dec. 31, 2019				$ 348		$ 279,511			$ 581,817		$ (5,940)	$ (6,731)		$ (1,496)		$ (250,751)			$ 596,758
Balance (in shares) at Dec. 31, 2019				22,780,208
Increase (Decrease) in Stockholders' Equity
Net (loss) income									8,392										8,392
Other comprehensive income (loss), net of tax											(6,692)								(6,692)
Release of shares, net of forfeitures						5						(7)				2
Release of shares, net of forfeitures (in shares)				59
Stock-based compensation												671							671
Proceeds from Preferred Stock issuance, net		$ 72,224																	72,224
Shares received related to tax withholding																(79)			(79)
Shares received related to tax withholding (in shares)				(3,025)
Cash dividends declared and paid to common stockholders, net									(4,915)										(4,915)
Repurchase of shares of Common Stock																(20,711)			(20,711)
Repurchase of shares of Common Stock (in shares)				(825,992)
Balance at Mar. 31, 2020		72,224		$ 348		279,516			585,294		(12,632)	(6,067)		(1,496)		(271,539)			645,648
Balance (in shares) at Mar. 31, 2020				21,951,250
Balance at Dec. 31, 2020	$ 116,569	116,569	$ 348	$ 348	$ 278,295	278,295	$ 1,686	$ 602,327	600,641	$ (5,924)	(5,924)		$ (1,496)	(1,496)	$ (287,337)	(287,337)	$ 1,686	$ 702,782	$ 701,096
Balance (in shares) at Dec. 31, 2020			21,232,984	21,232,984															21,232,984
Increase (Decrease) in Stockholders' Equity
Net (loss) income									(21,034)										$ (21,034)
Other comprehensive income (loss), net of tax											6,455								6,455
Reverse merger with Bridge Bancorp, Inc.				$ 65		206,641						(2,603)				287,107			491,210
Reverse merger with Bridge Bancorp, Inc. (in shares)				19,992,284
Exercise of stock options						292										80			372
Exercise of stock options (in shares)				15,928
Release of shares, net of forfeitures				$ 3		8,562						(8,340)				(33)			192
Release of shares, net of forfeitures (in shares)				335,959
Stock-based compensation												836							836
Shares received to satisfy distribution of retirement benefits						(1,359)								$ 1,496		(1,130)			(993)
Shares received to satisfy distribution of retirement benefits (in shares)				(41,101)
Cash dividends declared and paid to preferred stockholders									(1,821)										(1,821)
Cash dividends declared and paid to common stockholders, net									(5,175)										(5,175)
Balance at Mar. 31, 2021		$ 116,569		$ 416		$ 492,431			$ 574,297		$ 531	$ (10,107)				$ (1,313)			$ 1,172,824
Balance (in shares) at Mar. 31, 2021				41,536,054															41,536,054