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Significant Accounting Policies - Impacts of COVID-19 (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Jun. 01, 2020 | Dec. 31, 2020
Paycheck Protection Program |  |
Paycheck Protection Program ("PPP") |  |
Loans outstanding |  | $ 451.5
Amortized cost of the loans outstanding |  | 446.4
Loans outstanding, fees received |  | 25.4
Incurred incremental direct origination costs |  | 5.1
Net interest income for fees, net of deferred cost |  | $ 15.2
Percentage of remaining loan maintains government guarantee |  | 100.00%
Borrower loan forgiveness |  | $ 287.8
Forgiveness application amount |  | $ 167.4
5.25% fixed-to-floating rate notes due 2030 | Subordinated debt |  |
Impacts of COVID-19 |  |
Proceeds from public offering | $ 125.0 |

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