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Fair Value Measurements - Summary of Differences Between Fair Value and Principal Value (Details) $ in Thousands	Dec. 31, 2020 USD ($)
Aggregate Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage loans held for sale in loans held for sale	$ 417,771
Aggregate Unpaid Principal Balance
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage loans held for sale in loans held for sale	395,602
Difference
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage loans held for sale in loans held for sale	$ 22,169

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Fair value portion of mortgage loans held-for-sale.

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