Investments in Limited Partnerships (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Summary of Investment Holdings [Line Items]
Number of Investments in Affordable Housing Partnerships	16	16
Investments in Affordable Housing Partnerships Carrying Value, Net	$ 25.1	$ 20.4
Federal Affordable Housing Tax Credits	26.4
Expected Amortization of Investments in Affordable Housing Partnerships	25.1
Usage of Federal Affordable Housing Tax Credits	4.9	6.6	$ 8.0
Actual Amortization of Investments in Affordable Housing Partnerships	$ 4.2	$ 5.5	$ 5.8
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%