Business Combinations - Schedule of Supplemental Pro Forma Financial Information (Details) - USD ($) $ / shares in Units, $ in Thousands	8 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings per share, pro forma:
Net interest income, pro forma			$ 247,550
Provision for loan losses, pro forma			2,211
Non-interest income, pro forma			35,010
Non-interest expense, pro forma			176,294
Provision (benefit) for income taxes, pro forma			20,233
Net income, pro forma			$ 83,822
Fully diluted, pro forma (in usd per share)			$ 1.36
Two River Bancorp Inc.
Earnings per share, actual:
Net interest income, actual		$ 31,354
Provision for loan losses, actual		6,471
Non-interest income, actual		1,886
Non-interest expense, actual		23,422
Provision (benefit) for income taxes, actual		809
Net income, actual		2,538
Country Bank Holding Company, Inc
Earnings per share, actual:
Net interest income, actual		20,456
Provision for loan losses, actual		4,398
Non-interest income, actual		408
Non-interest expense, actual		14,470
Provision (benefit) for income taxes, actual		482
Net income, actual		$ 1,514
Capital Bank
Earnings per share, actual:
Net interest income, actual	$ 12,700
Provision for loan losses, actual	280
Non-interest income, actual	991
Non-interest expense, actual	11,035
Provision (benefit) for income taxes, actual	499
Net income, actual	$ 1,877