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Significant Accounting Policies - Impacts of COVID-19 (Details)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 01, 2020
USD ($)
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Sep. 30, 2020
USD ($)
customer
Paycheck Protection Program        
Paycheck Protection Program ("PPP")        
Loans outstanding   $ 749.4   $ 749.4
Amortized cost of the loans outstanding   736.4   $ 736.4
New and existing customers | customer       4,569
Loans outstanding, fees received       $ 25.4
Incurred incremental direct origination costs   5.1   $ 5.1
Net interest income   $ 4.2 $ 3.0  
Percentage of remaining loan maintains government guarantee   100.00%   100.00%
Loan forgiveness       $ 0.0
5.25% fixed-to-floating rate notes due 2030 | Subordinated debt        
Impacts of COVID-19        
Proceeds from public offering $ 125.0   $ 125.0  
Interest rate (as a percent)     5.25%