Annual report pursuant to Section 13 and 15(d)

Available-for-Sale Securities Pledged as Collateral for Financing (Details)

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Available-for-Sale Securities Pledged as Collateral for Financing (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Available-for-sale securities, at fair value $ 8,327,149 $ 7,778,734
Asset Pledged as Collateral    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Available-for-sale securities, at fair value $ 8,100,000 $ 7,400,000