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Disclosures About Offsetting Assets and Liabilities (Financial Liabilities and Derivative Liabilities that are Subject to Offset) (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Offsetting Liabilities [Line Items]    
Gross amounts of recognized liabilities, Securities lending $ (149,219) $ (145,124)
Net amounts presented in the Statement of Financial Condition, Securities lending (149,219) (145,124)
Gross amounts not offset in the Statement of Financial Position, Financial instruments, Securities lending 40,259 46,183
Gross amounts not offset in the Statement of Financial Position, Collateral pledged, Securities lending 108,955 98,925
Securities lending, Net amount (5) (16)
Gross amounts of recognized liabilities, Securities purchased under agreements to resell (385,528) (190,955)
Net amounts presented in the Statement of Financial Condition, Securities purchased under agreements to resell (385,528) (190,955)
Gross amounts not offset in the Statement of Financial Position, Financial instruments, Securities purchased under agreements to resell 52,413 17,992
Gross amounts not offset in the Statement of Financial Position, Collateral pledged, Securities purchased under agreements to resell 333,115 172,963
Gross amounts of recognized liabilities (586,894) (336,079)
Net amounts presented in the Statement of Financial Condition (586,894) (336,079)
Gross amounts not offset in the Statement of Financial Position, Financial instruments 117,821 64,175
Gross amounts not offset in the Statement of Financial Condition, Collateral pledged 469,068 271,888
Net amount (5) $ (16)
Interest Rate Contracts [Member]    
Offsetting Liabilities [Line Items]    
Gross amounts of recognized liabilities (52,147)  
Net amounts presented in the Statement of Financial Condition (52,147)  
Gross amounts not offset in the Statement of Financial Position, Financial instruments 25,149  
Gross amounts not offset in the Statement of Financial Condition, Collateral pledged $ 26,998