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Summary of Significant Accounting Policies - Intangible assets, Transfer of financial assets (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Intangible Assets
Goodwill	$ 1,581,085	$ 1,581,085	$ 1,563,942	$ 1,002,900
Impairment Charges	$ 0	$ 0	$ 0
Minimum
Intangible Assets
Estimated useful lives of intangibles		2 years
Maximum
Intangible Assets
Estimated useful lives of intangibles		15 years
Core deposit intangibles | Minimum
Intangible Assets
Estimated useful lives of intangibles		10 years
Core deposit intangibles | Maximum
Intangible Assets
Estimated useful lives of intangibles		13 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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