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Disclosures About Offsetting Assets and Liabilities (Financial Assets and Derivative Assets that are Subject to Offset) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Offsetting [Abstract] |  |
Gross amounts of recognized assets, Securities borrowing | $ 314,154 | $ 313,131
Net amounts presented in the Statement of Financial Condition, Securities borrowing | 314,154 | 313,131
Gross amounts not offset in the Statement of Financial Position, Financial instruments, Securities borrowing | (39,225) | (46,183)
Gross amounts not offset in the Statement of Financial Position, Collateral received, Securities borrowing | (260,229) | (244,578)
Securities borrowed, Net amount | 14,700 | 22,370
Gross amounts of recognized assets, Reverse repurchase agreements | 598,535 | 217,930
Net amounts presented in the Statement of Financial Condition, Securities purchased under agreements to resell | 598,535 | 217,930
Gross amounts not offset in the Statement of Financial Position, Financial instruments, Securities purchased under agreements to resell | (10,655) | (17,992)
Gross amounts not offset in the Statement of Financial Position, Collateral received, Securities purchased under agreements to resell | (584,240) | (199,110)
Securities purchased under agreements to resell, Net amount | 3,640 | 828
Gross amounts of recognized assets | 912,689 | 531,061
Net amounts presented in the Statements of Financial Condition | 912,689 | 531,061
Gross amounts not offset in the Statement of Financial Position | (49,880) | (64,175)
Gross amounts not offset in the Statement of Financial Position, Collateral received | (844,469) | (443,688)
Net amount | $ 18,340 | $ 23,198

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