Annual report pursuant to Section 13 and 15(d)

Basis of Presentation and Summary of Significant Accounting Policies - Concentrations of credit risk (Details)

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Basis of Presentation and Summary of Significant Accounting Policies - Concentrations of credit risk (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Basis of Presentation and Summary of Significant Accounting Policies    
Deposits $ 213.6 $ 29.0