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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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Amount of loan forgiveness application on behalf of borrowers submitted to SBA related to the PPP (Paycheck Protection Program).

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Represents the incurred incremental direct origination costs related to the PPP (Paycheck Protection Program).

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Percentage of remaining balance after loan forgiveness maintains a government guarantee.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
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The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

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