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Summary of Significant Accounting Policies - Intangible assets, Transfer of financial assets (Details) $ in Millions		12 Months Ended
	Apr. 30, 2019 USD ($)	Dec. 31, 2019 USD ($) item
Intangible Assets
Number of reportable operating segments | item		2
Impairment Charges | $	$ 0.0	$ 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
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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