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Derivatives - Fair Values of Derivatives Reported on Condensed Consolidated Statements of Financial Condition (Parenthetical) (Detail) - Total Return Swaps [Member] - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Derivatives, Fair Value [Line Items]    
Gross derivative assets $ 818 $ 152
Gross derivative liability 8,557 9,797
Cash collateral pledged for total return swaps $ 6,212 $ 6,893