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Consolidated Statements of Financial Condition (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Investment Securities and Certificates of Deposit, amortized cost $ 813,507 $ 744,178  
Accounts Receivable, allowances 2,253 5,603 $ 4,683
Furniture, Equipment and Leasehold Improvements, accumulated depreciation and amortization $ 151,455 $ 212,929  
Treasury Stock, Common, Shares (in shares) 46,651,572 44,340,396  
Class A [Member]      
Common Stock, Par Value (in dollars per share) $ 0.01 $ 0.01  
Common Stock, Shares Authorized (in shares) 1,000,000,000 1,000,000,000  
Common Stock, Shares, Issued (in shares) 84,767,922 82,114,009  
Common Stock, Shares, Outstanding (in shares) 38,116,350 37,773,613  
Class B [Member]      
Common Stock, Par Value (in dollars per share) $ 0.01 $ 0.01  
Common Stock, Shares Authorized (in shares) 1,000,000 1,000,000  
Common Stock, Shares, Issued (in shares) 45 46  
Common Stock, Shares, Outstanding (in shares) 45 46