Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	Two River Bancorp Inc.	Country Bank Holding Company, Inc	Cumulative Effect, Period Of Adoption, Adjustment	Employee Stock Ownership Plan	Preferred Stock	Common Stock	Common Stock Two River Bancorp Inc.	Common Stock Country Bank Holding Company, Inc	Additional Paid-In Capital	Additional Paid-In Capital Two River Bancorp Inc.	Additional Paid-In Capital Country Bank Holding Company, Inc	Retained Earnings	Retained Earnings Cumulative Effect, Period Of Adoption, Adjustment	Accumulated Other Comprehensive (Loss) Income	Treasury Stock	Treasury Stock Two River Bancorp Inc.
Beginning 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]
Net income	16,533												16,533
Other comprehensive income, net of tax	1,717														1,717
Stock compensation	1,108						2			1,106
Allocation of ESOP stock	347				304					43
Cash dividend per share	(10,274)												(10,274)
Exercise of stock options	657						2			1,305			(650)
Purchase of shares of common stock	(14,814)															(14,814)
Acquisition, value		$ 148,609	$ 112,836					$ 42	$ 44		$ 122,501	$ 112,792					$ 26,066
Ending Balance at Mar. 31, 2020	1,409,834				(8,344)	0	609			1,078,438			364,273		509	(25,651)
Beginning Balance at Dec. 31, 2020	1,484,130				(7,433)	1	609			1,137,715			378,268		621	(25,651)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	32,697												32,697
Other comprehensive income, net of tax	(309)														(309)
Stock compensation	1,237									1,237
Allocation of ESOP stock	352				304					48
Cash dividend per share	(10,152)												(10,152)
Exercise of stock options	1,762						1			3,290			(1,529)
Purchase of shares of common stock	(9,994)															(9,994)
Preferred stock dividend	(1,004)												(1,004)
Ending Balance at Mar. 31, 2021	$ 1,498,719				$ (7,129)	$ 1	$ 610			$ 1,142,290			$ 398,280		$ 312	$ (35,645)