Investments (Repurchase Agreements and Securities Lending) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Total Cash collateral for loaned securities	$ 3,004	$ 2,725
Overnight and Continuous
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Total Cash collateral for loaned securities	3,004	2,725
Up 30 Days
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Total Cash collateral for loaned securities	0	0
30 days or greater
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Total Cash collateral for loaned securities	0	0
U.S. public corporate securities
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Total Cash collateral for loaned securities	3,004	0
U.S. public corporate securities | Overnight and Continuous
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Total Cash collateral for loaned securities	3,004	0
U.S. public corporate securities | Up 30 Days
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Total Cash collateral for loaned securities	0	0
Foreign public corporate securities
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Total Cash collateral for loaned securities	0	2,725
Foreign public corporate securities | Overnight and Continuous
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Total Cash collateral for loaned securities	0	2,725
Foreign public corporate securities | Up 30 Days
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Total Cash collateral for loaned securities	$ 0	$ 0