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Fair Value Measurements - Summary of Differences Between Fair Value and Principal Value (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Mortgage loans held for sale in loans held for sale | $ 318,272 | $ 219,848
Aggregate Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Mortgage loans held for sale in loans held for sale | 318,272 |
Past due loans of 90 days or more | 0 |
Nonaccrual loans | 0 |
Aggregate Unpaid Principal Balance |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Mortgage loans held for sale in loans held for sale | 308,160 |
Past due loans of 90 days or more | 0 |
Nonaccrual loans | 0 |
Difference |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Mortgage loans held for sale in loans held for sale | 10,112 |
Past due loans of 90 days or more | 0 |
Nonaccrual loans | $ 0 |

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