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Investments in Limited Partnerships (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Summary of Investment Holdings [Line Items] |  |  |
Number of Investments in Affordable Housing Partnerships | 16 | 15 |
Investments in Affordable Housing Partnerships Carrying Value, Net | $ 20.4 | $ 22.8 |
Federal Affordable Housing Tax Credits | 22.1 |  |
Expected Amortization of Investments in Affordable Housing Partnerships | 20.4 |  |
Usage of Federal Affordable Housing Tax Credits | 6.6 | 8.0 | $ 6.6
Actual Amortization of Investments in Affordable Housing Partnerships | $ 5.5 | $ 5.8 | $ 5.0
For the First three years |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage of investments on credit allowance period | 5.00% |  |
For the next four years |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage of investments on credit allowance period | 6.00% |  |

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