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Loans Held for Sale - Summary of Activity in Balance of Loans Held for Sale, at Fair Value (Footnote) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Increase (decrease) in fair value of loans held for sale	$ (6,700)	$ (7,800)	$ (7,200)
Loans held for sale, at fair value	366,364	$ 208,752	$ 176,525	$ 214,262
Repurchased Ginnie Mae Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for sale, at fair value	$ 51,100

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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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- Definition

The increase (decrease) during the period in book value of long-lived assets that the reporting entity plans to sell within one year (or one business cycle).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

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- Definition

Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables.

+ References

No definition available.

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- Details

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