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Goodwill - Narrative (Details) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Sep. 01, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Goodwill	$ 543,918,000	$ 543,918,000	$ 543,918,000		$ 445,355,000
Measurement period adjustment			$ 719,000
Goodwill impairment loss		$ 0
MBT
Business Acquisition [Line Items]
Goodwill				$ 98,563,000
Measurement period adjustment	$ 719,000

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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