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Commitments and Contingencies (Narrative) (Details)
$ in Thousands
Jun. 30, 2023
USD ($)
Other Commitments [Line Items]  
FHLB funding agreements outstanding $ 0
Limited Partnerships  
Other Commitments [Line Items]  
Unfunded commitments 794,700
Fixed Maturity Securities  
Other Commitments [Line Items]  
Unfunded commitments 1,100,000
Other Investments  
Other Commitments [Line Items]  
Unfunded commitments 52,300
Asset Pledged as Collateral without Right | Federal Home Loan Bank Advances  
Other Commitments [Line Items]  
Fixed maturity security investments pledged for FHLB $ 1,500,000