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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% |

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