Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	Sun Bancorp Inc	Two River Bancorp Inc.	OCFCCountry Bank Holding Company Inc	Cumulative Effect, Period of Adoption, Adjustment	Employee Stock Ownership Plan	Preferred Stock	Common Stock	Common Stock Sun Bancorp Inc	Common Stock Two River Bancorp Inc.	Common Stock OCFCCountry Bank Holding Company Inc	Additional Paid-In Capital	Additional Paid-In Capital Sun Bancorp Inc	Additional Paid-In Capital Two River Bancorp Inc.	Additional Paid-In Capital OCFCCountry Bank Holding Company Inc	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive (Loss) Gain	Accumulated Other Comprehensive (Loss) Gain Cumulative Effect, Period of Adoption, Adjustment	Treasury Stock	Treasury Stock Sun Bancorp Inc	Treasury Stock Two River Bancorp Inc.
Beginning Balance at Dec. 31, 2017	$ 601,941				$ 0	$ (2,479)	$ 0	$ 336				$ 354,377				$ 271,023	$ (147)	$ (5,349)	$ 147	$ (15,967)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	71,932															71,932
Other comprehensive income, net of tax	1,752																	1,752
Stock awards	3,038							2				3,036
Acquisition of common stock by ESOP	(8,400)					(8,400)
Allocation of ESOP stock	1,618					1,022						596
Cash dividend	(29,564)															(29,564)
Exercise of stock options	5,324							4				13,306				(8,188)				202
Acquisition of company		$ 402,554							$ 141				$ 386,648								$ 15,765
Purchase shares of common stock	(10,837)																			(10,837)
Ending Balance at Dec. 31, 2018	1,039,358					(9,857)	0	483				757,963				305,056		(3,450)		(10,837)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	88,574															88,574
Other comprehensive income, net of tax	2,242																	2,242
Stock awards	3,861							2				3,859
Allocation of ESOP stock	1,575					1,209						366
Cash dividend	(34,241)															(34,241)
Exercise of stock options	1,335							2				2,054				(721)				0
Acquisition of company	76,481							32				76,449								0
Purchase shares of common stock	(26,066)																			(26,066)
Ending Balance at Dec. 31, 2019	$ 1,153,119				$ (4)	(8,648)	0	519				840,691				358,668	$ (4)	(1,208)		(36,903)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member
Net income	$ 63,309															63,309
Other comprehensive income, net of tax	1,829																	1,829
Stock awards	4,258							2				4,256
Allocation of ESOP stock	1,135					1,215						(80)
Cash dividend	(40,820)															(40,820)
Exercise of stock options	1,241							2				2,027				(788)				0
Proceeds from preferred stock issuance, net of costs	55,529						1					55,528
Preferred stock dividend	(2,097)															(2,097)
Acquisition of company			$ 148,609	$ 112,836						$ 42	$ 44			$ 122,501	$ 112,792							$ 26,066
Purchase shares of common stock	(14,814)																			(14,814)
Ending Balance at Dec. 31, 2020	$ 1,484,130					$ (7,433)	$ 1	$ 609				$ 1,137,715				$ 378,268		$ 621		$ (25,651)