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Borrowings and Financing Activities - Narrative (Details)
6 Months Ended
Jun. 30, 2023
USD ($)
Jul. 31, 2023
USD ($)
Apr. 30, 2023
USD ($)
Dec. 31, 2022
USD ($)
Debt Instrument [Line Items]        
Collateral $ 5,895,871,000     $ 5,693,491,000
Minimum net worth for debt covenants 2,600,000      
Revolving Credit Facility        
Debt Instrument [Line Items]        
Current borrowing capacity 275,000,000      
Fair value of amount outstanding 0      
Mortgages | BMO Master Repurchase Agreement        
Debt Instrument [Line Items]        
Maximum borrowing capacity     $ 150,000,000 300,000,000
Outstanding borrowings 42,000,000      
Mortgages | Goldman Sachs Master Repurchase Agreement        
Debt Instrument [Line Items]        
Long-term debt       300,000,000
Outstanding borrowings $ 7,000,000      
Mortgages | Goldman Sachs Master Repurchase Agreement | Subsequent Event        
Debt Instrument [Line Items]        
Long-term debt   $ 100,000,000    
Minimum | FHLB advances        
Debt Instrument [Line Items]        
FHLB, ratio of market value of collateral to advances 1.03      
Maximum | FHLB advances        
Debt Instrument [Line Items]        
FHLB, ratio of market value of collateral to advances 1.14      
Fixed maturities AFS and trading securities | Debt securities        
Debt Instrument [Line Items]        
FHLB, collateral pledged $ 139,000,000     164,000,000
Mortgage loans held for sale | Asset Pledged as Collateral        
Debt Instrument [Line Items]        
Collateral $ 51,000,000     $ 2,000,000