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Borrowings and Financing Activities - Narrative (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2022
USD ($)
Jul. 15, 2022
USD ($)
Dec. 31, 2021
USD ($)
Debt Instrument [Line Items]      
FHLB advances, carrying value $ 184,284   $ 150,983
FHLB, maturity period, fixed rate 90 days    
FHLB advances      
Debt Instrument [Line Items]      
FHLB advances, carrying value $ 184,284   150,983
FHLB, weighted average interest rate 1.18%    
Revolving Credit Facility      
Debt Instrument [Line Items]      
Current borrowing capacity $ 275,000    
Fair value of amount outstanding $ 0    
Mortgages | Mortgage Financing Facility | Subsequent Event      
Debt Instrument [Line Items]      
Long-term debt   $ 300,000  
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 $ 207,200   $ 167,300