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Balance Sheet Offsetting - Secured Borrowings (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2022
USD ($)
item
Dec. 31, 2021
USD ($)
item
Transfer of Certain Financial Assets Accounted for as Secured Borrowings    
Number of repurchase-to-maturity transactions outstanding | item 0 0
Total borrowings $ 1,374,438 $ 1,623,679
Gross amount of recognized liabilities for repurchase agreements and securities lending in offsetting disclosure above $ 1,374,438 1,623,679
Minimum    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings    
Security repurchase agreement maturity period 1 day  
Maximum    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings    
Security repurchase agreement maturity period 90 days  
Overnight and Continuous    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings    
Total borrowings $ 1,254,449 1,525,847
Maturity up to 30 days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings    
Total borrowings 53,624  
Maturity 30 to 90 Days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings    
Total borrowings 61,715 86,357
Maturity over 90 days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings    
Total borrowings 4,650 11,475
Assets-backed securities    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings    
Repurchase agreements transactions 302,030 191,483
Assets-backed securities | Overnight and Continuous    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings    
Repurchase agreements transactions 182,041 93,651
Assets-backed securities | Maturity up to 30 days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings    
Repurchase agreements transactions 53,624  
Assets-backed securities | Maturity 30 to 90 Days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings    
Repurchase agreements transactions 61,715 86,357
Assets-backed securities | Maturity over 90 days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings    
Repurchase agreements transactions 4,650 11,475
Corporate Debt Securities    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings    
Securities lending transactions 113 113
Corporate Debt Securities | Overnight and Continuous    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings    
Securities lending transactions 113 113
Equity Securities    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings    
Securities lending transactions 1,072,295 1,432,083
Equity Securities | Overnight and Continuous    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings    
Securities lending transactions $ 1,072,295 $ 1,432,083