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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

X
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