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Fair Value Measurements - Summarizes Differences Between Fair Value and Principal Balance for Mortgage Loans Held for Sale Measure at Fair Value (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
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Aggregate Fair Value |  |
Summarizes differences between fair value and principal balance for mortgage loans held for sale measure at fair value |  |
Mortgage loans held for sale measured at fair value | $ 399,773 | $ 318,272
Aggregate Unpaid Principal Balance |  |
Summarizes differences between fair value and principal balance for mortgage loans held for sale measure at fair value |  |
Mortgage loans held for sale measured at fair value | 378,785 | 308,160
Difference |  |
Summarizes differences between fair value and principal balance for mortgage loans held for sale measure at fair value |  |
Mortgage loans held for sale measured at fair value | $ 20,988 | $ 10,112

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- Definition Fair value portion of mortgage loans held-for-sale. + References No definition available. + Details
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