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Summary of Significant Accounting Policies - Intangible assets, Transfer of financial assets (Details) - USD ($) $ in Thousands		12 Months Ended
	Apr. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Intangible Assets
Goodwill		$ 1,563,942	$ 1,002,900	$ 1,002,900
Impairment Charges	$ 0	$ 0
Minimum
Intangible Assets
Estimated useful lives of intangibles		2 years
Maximum
Intangible Assets
Estimated useful lives of intangibles		15 years
Core Deposits | Minimum
Intangible Assets
Estimated useful lives of intangibles		10 years
Core Deposits | Maximum
Intangible Assets
Estimated useful lives of intangibles		13 years
Noncompete intangibles | Minimum
Intangible Assets
Estimated useful lives of intangibles		2 years
Noncompete intangibles | Maximum
Intangible Assets
Estimated useful lives of intangibles		3 years
Client list intangibles
Intangible Assets
Estimated useful lives of intangibles		15 years

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- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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-Name Accounting Standards Codification
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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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