Business Combinations - Additional Information (Details) $ in Thousands			9 Months Ended
	Jan. 01, 2020 USD ($)	Jan. 31, 2019 USD ($)	Sep. 30, 2020 USD ($) property
Capital Bank
Business Acquisition [Line Items]
Purchase accounting adjustments, assets		$ 494,416
Purchase accounting adjustments, loans		307,300
Purchase accounting adjustments, deposits		449,018
Total consideration paid		76,834
Cash consideration		353
Core deposit intangible		$ 2,662	$ 2,700
Two River Bancorp Inc.
Business Acquisition [Line Items]
Purchase accounting adjustments, assets	$ 1,112,041
Purchase accounting adjustments, loans	940,072
Purchase accounting adjustments, deposits	941,750
Total consideration paid	197,050
Cash consideration	48,400
Core deposit intangible	12,130		12,100
Country Bank Holding Company, Inc
Business Acquisition [Line Items]
Purchase accounting adjustments, assets	792,710
Purchase accounting adjustments, loans	618,408
Purchase accounting adjustments, deposits	652,653
Total consideration paid	112,836
Core deposit intangible	$ 2,117		$ 2,100
Core Deposits
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, weighted average useful life			10 years
Capital Bank
Business Acquisition [Line Items]
Number of properties subject to lease agreement | property			1
Two River Bancorp Inc.
Business Acquisition [Line Items]
Number of properties subject to lease agreement | property			14
Country Bank Holding Company, Inc
Business Acquisition [Line Items]
Number of properties subject to lease agreement | property			5