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Significant Accounting Policies - COVID-19 Pandemic (Details) $ in Millions	3 Months Ended
	Mar. 31, 2021 USD ($) customer	Dec. 31, 2020 USD ($)
Paycheck Protection Program ("PPP")
Percentage of remaining loan maintains government guarantee	100.00%
Paycheck Protection Program
Paycheck Protection Program ("PPP")
Loans outstanding	$ 533.4
Amortized cost of the loans outstanding	$ 522.1	$ 446.4
Number of customers | customer	3,441
Paycheck Protection Program First Round [Member]
Paycheck Protection Program ("PPP")
Total loans	$ 749.4
New and existing customers | customer	4,569
Loan forgiveness	$ 478.5
Forgiveness application amount	131.6
Net fee income accretion	3.3
Paycheck Protection Program Second Round [Member]
Paycheck Protection Program ("PPP")
Total loans	$ 262.5
New and existing customers | customer	2,123
Net fee income accretion	$ 0.3

X

- Definition

Represents the amortized cost of the loans outstanding related to the PPP (paycheck protection program).

+ References

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- Definition

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

+ References

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+ Details

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- Definition

Net fees income accretion recognized during the period.

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- Definition

Represents the number of customers related to the PPP (Paycheck Protection Program).

+ References

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- Definition

Represents the number of new and existing customers related to the PPP (Paycheck Protection Program).

+ References

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- Definition

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

+ References

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- Definition

Decrease for amounts of indebtedness forgiven by the holder of the debt instrument.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(f))
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- Definition

Amount, before allowance for credit loss and fee, of financing receivable. Excludes financing receivable covered under loss sharing agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
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- Definition

The cash inflow associated with the sale of loans receivables arising from the financing of goods and services.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
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