XML 73 R56.htm IDEA: XBRL DOCUMENT v3.22.2.2
Debt - Additional Information (Details) - USD ($)
9 Months Ended
May 19, 2022
Sep. 30, 2022
Sep. 15, 2022
Dec. 31, 2021
Debt Instrument [Line Items]        
FHLB stock   $ 13,000,000   $ 7,900,000
Long-term debt, net, book value   1,792,974,000   $ 1,696,246,000
Estimate of Fair Value Measurement | Asset Pledged as Collateral        
Debt Instrument [Line Items]        
Fair value of pledged assets   $ 737,000,000    
Junior Subordinated Debentures Due 2056        
Debt Instrument [Line Items]        
Interest rate   4.25%    
Senior notes        
Debt Instrument [Line Items]        
Optional redemption, period from issuance date   5 years    
Senior notes | 4.80% Senior Notes Due June 15, 2032        
Debt Instrument [Line Items]        
Debt, principal amount $ 400,000,000      
Interest rate 4.80%      
Par acquired by affiliates $ 150,000,000      
Total proceeds from issuance of debt to parent 395,000,000      
Senior Notes Due 2022        
Debt Instrument [Line Items]        
Interest rate   3.80% 3.80%  
Par acquired by affiliates 150,000,000      
Debt repayment $ 300,000,000      
Federal Home Loan Bank Borrowings        
Debt Instrument [Line Items]        
Long-term debt, net, book value   $ 0    
Maximum borrowing capacity   $ 526,000,000