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Guarantees and Off-Balance Sheet Arrangements Details (Tables)
 12 Months Ended
Dec. 31, 2020
Guarantees and Off Balance Sheet Arrangements [Abstract]  
Schedule of Subordinated Borrowing The Company maintains uncommitted financing arrangements with large financial institutions, the details of which are summarized below as of December 31, 2020.
LenderContractual AmountAvailable AmountMaturity DateDescription
Pledge Lines(dollars in thousands)
BMO Harris Bank$75,000 $75,000 NoneSecured Tri-Party Pledge Facility
BMO Harris Bank150,000 150,000 NoneSecured Depository Trust Company Pledge Line
       Total225,000 225,000 
Spike Line
BMO Harris Bank
Canadian Imperial Bank
of Commerce
Texas Capital Bank		70,000 70,000 August 20, 2021Unsecured committed spike line facility to cover short term increases in National Securities Clearing Corporation margin deposit requirements
Revolving Credit Facility
BMO Harris Bank25,000 25,000 December 2, 2021Unsecured Corporate Revolver
Total Credit Lines$320,000 $320,000