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Fair Value Measurements - Debt Securities (Details) - Mortgage banking derivatives - Pricing Model - Fair Value, Inputs, Level 3 - Measurement Input, Pull Through Rate $ in Thousands | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
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Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value | $ 2,514 | $ 5,213
Weighted Average |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement input | 0.8330 | 0.7914
Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement input | 0.812 |
Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement input | 0.919 |

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