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Business Combinations - Additional Information (Details) $ in Thousands				3 Months Ended				12 Months Ended
	Jan. 01, 2020 USD ($)	Jan. 31, 2019 USD ($)	Jan. 31, 2018 USD ($)	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($) property	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Business Acquisition [Line Items]
Merger related expenses				$ 1,194	$ 3,156	$ 3,070	$ 8,527	$ 15,947	$ 10,503	$ 26,911
Two River Bancorp Acquisition
Business Acquisition [Line Items]
Purchase accounting adjustments, assets	$ 1,111,621
Purchase accounting adjustments, loans	940,072
Deposits	941,750
Consideration paid	197,050
Cash consideration paid for outstanding warrants and fractional shares	48,400
Number of properties in lease agreements | property								14
Core deposit intangible	12,130
Country Bank Holding Company, Inc. Acquisition
Business Acquisition [Line Items]
Purchase accounting adjustments, assets	793,680
Purchase accounting adjustments, loans	618,408
Deposits	652,653
Consideration paid	112,836
Number of properties in lease agreements | property								5
Core deposit intangible	$ 2,117
Sun Bancorp, Inc.
Business Acquisition [Line Items]
Purchase accounting adjustments, assets			$ 2,044,054
Purchase accounting adjustments, loans			1,517,345
Deposits			1,616,073
Consideration paid			474,930
Cash consideration paid for outstanding warrants and fractional shares			72,400
Number of properties in lease agreements | property								21
Core deposit intangible		$ 2,662
Weighted average useful life (years)								10 years
Capital Bank
Business Acquisition [Line Items]
Purchase accounting adjustments, assets		494,416
Purchase accounting adjustments, loans		307,300
Deposits		449,018
Consideration paid		76,834
Cash consideration paid for outstanding warrants and fractional shares		$ 353
Number of properties in lease agreements | property								1
Core deposit intangible			$ 11,897

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Business combination recognized identifiable assets acquired and liabilities assumed core deposit intangible.

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Number of properties in lease agreements.

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Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Amount of assets acquired at the acquisition date.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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