Servicing Assets (Key Economic Assumptions) (Details)	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Maximum [Member]
Servicing Assets At Fair Value [Line Items]
Constant prepayment rate	35.22%	18.81%	9.02%
Discount rate	15.50%	15.00%	12.00%
Minimum [Member]
Servicing Assets At Fair Value [Line Items]
Constant prepayment rate	5.02%	4.47%	4.30%
Discount rate	10.00%	10.00%	10.00%

Discount rate used to estimate the fair value of servicing assets and servicing liabilities.

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 50
-Paragraph 2
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=116651436&loc=d3e122596-111746

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- Definition

Estimated rate of prepayments of principal on servicing assets and servicing liabilities.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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