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	30,245												30,245
Other comprehensive income (loss), net of tax	2,148														2,148
Stock compensation	3,729						2			3,727
Allocation of ESOP stock	866				911					(45)
Cash dividend per share	(30,630)												(30,630)
Exercise of stock options	1,174						2			1,961			(789)
Issuance of preferred equity, net of costs	55,529					1				55,528
Repurchased shares of common stock	(14,814)															(14,814)
Preferred stock dividend	(1,093)												(1,093)
Acquisition, value		$ 148,609	$ 112,836					$ 42	$ 44		$ 122,501	$ 112,792					$ 26,066
Ending Balance at Sep. 30, 2020	1,461,714				(7,737)	1	609			1,137,155			356,397		940	(25,651)
Beginning 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]
Net income	(4,926)												(4,926)
Other comprehensive income (loss), net of tax	(185)														(185)
Stock compensation	1,250									1,250
Allocation of ESOP stock	258				304					(46)
Cash dividend per share	(10,136)												(10,136)
Exercise of stock options	296									296
Issuance of preferred equity, net of costs	(184)									(184)
Preferred stock dividend	(1,093)												(1,093)
Ending Balance at Sep. 30, 2020	1,461,714				(7,737)	1	609			1,137,155			356,397		940	(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	87,419												87,419
Other comprehensive income (loss), net of tax	(1,355)														(1,355)
Stock compensation	4,231						0			4,231
Allocation of ESOP stock	1,056				914					142
Cash dividend per share	(30,425)												(30,425)
Exercise of stock options	1,833						2			3,360			(1,529)
Repurchased shares of common stock	(30,628)															(30,628)
Preferred stock dividend	(3,012)												(3,012)
Ending Balance at Sep. 30, 2021	1,513,249				(6,519)	1	611			1,145,448			430,721		(734)	(56,279)
Beginning Balance at Jun. 30, 2021	1,508,789				(6,824)	1	611			1,143,907			417,658		26	(46,590)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	24,167												24,167
Other comprehensive income (loss), net of tax	(760)														(760)
Stock compensation	1,505									1,505
Allocation of ESOP stock	336				305					31
Cash dividend per share	(10,100)												(10,100)
Exercise of stock options	5									5
Repurchased shares of common stock	(9,689)															(9,689)
Preferred stock dividend	(1,004)												(1,004)
Ending Balance at Sep. 30, 2021	$ 1,513,249				$ (6,519)	$ 1	$ 611			$ 1,145,448			$ 430,721		$ (734)	$ (56,279)