Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Employee Stock Ownership Plan	Preferred Stock	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Treasury Stock	Capital Bank of New Jersey	Capital Bank of New Jersey Common Stock	Capital Bank of New Jersey Additional Paid-In Capital	Two River Bancorp Inc.	Two River Bancorp Inc. Common Stock	Two River Bancorp Inc. Additional Paid-In Capital	Two River Bancorp Inc. Treasury Stock	Country Bank Holding Company, Inc	Country Bank Holding Company, Inc Common Stock	Country Bank Holding Company, Inc Additional Paid-In Capital	Cumulative Effect, Period Of Adoption, Adjustment	Cumulative Effect, Period Of Adoption, Adjustment Retained Earnings
Beginning 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	40,153					40,153
Other comprehensive income, net of tax	1,807						1,807
Stock awards	2,602			2	2,600
Allocation of ESOP stock	801	605			196
Cash dividend per share	(17,304)					(17,304)
Exercise of stock options	795			1	1,402	(608)
Purchase of shares of common stock	(7,398)							(7,398)
Acquisition, value									$ 76,481	$ 32	$ 76,449
Ending Balance at Jun. 30, 2019	1,137,295	(9,252)	0	518	838,610	327,297	(1,643)	(18,235)
Beginning Balance at Dec. 31, 2018	1,039,358	(9,857)	0	483	757,963	305,056	(3,450)	(10,837)
Ending Balance at Dec. 31, 2019	$ 1,153,119	(8,648)	0	519	840,691	358,668	(1,208)	(36,903)											$ (4)	$ (4)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate2016-13Member
Beginning Balance at Mar. 31, 2019	$ 1,127,163	(9,554)	0	518	836,546	316,976	(2,681)	(14,642)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	18,980					18,980
Other comprehensive income, net of tax	1,038						1,038
Stock awards	1,690				1,690
Allocation of ESOP stock	401	302			99
Cash dividend per share	(8,660)					(8,660)
Exercise of stock options	276				275	1
Purchase of shares of common stock	(3,593)							(3,593)
Sale (purchase) of stock for the deferred compensation plan	0
Ending Balance at Jun. 30, 2019	1,137,295	(9,252)	0	518	838,610	327,297	(1,643)	(18,235)
Beginning Balance at Dec. 31, 2019	1,153,119	(8,648)	0	519	840,691	358,668	(1,208)	(36,903)											$ (4)	$ (4)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	35,171					35,171
Other comprehensive income, net of tax	2,333						2,333
Stock awards	2,479			2	2,477
Allocation of ESOP stock	608	607			1
Cash dividend per share	(20,494)					(20,494)
Exercise of stock options	878			2	1,665	(789)
Purchase of shares of common stock	(14,814)							(14,814)
Acquisition, value												$ 148,609	$ 42	$ 122,501	$ 26,066	$ 112,836	$ 44	$ 112,792
Issuance of preferred equity	55,713		1		55,712
Ending Balance at Jun. 30, 2020	$ 1,476,434	(8,041)	1	609	1,135,839	372,552	1,125	(25,651)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate2016-13Member
Beginning Balance at Mar. 31, 2020	$ 1,409,834	(8,344)	0	609	1,078,438	364,273	509	(25,651)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	18,638					18,638
Other comprehensive income, net of tax	616						616
Stock awards	1,371				1,371
Allocation of ESOP stock	261	303			(42)
Cash dividend per share	(10,220)					(10,220)
Exercise of stock options	221				360	(139)
Issuance of preferred equity	55,713		1		55,712
Ending Balance at Jun. 30, 2020	$ 1,476,434	$ (8,041)	$ 1	$ 609	$ 1,135,839	$ 372,552	$ 1,125	$ (25,651)