Guarantees and Off-Balance Sheet Arrangements Details (Tables)

12 Months Ended

Dec. 31, 2018

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, 2018.

Lender	Contractual Amount		Available Amount		Maturity Date	Description
Pledge Lines	(dollars in thousands)
Texas Capital Bank	$	75,000	$	75,000	None	Secured Depository Trust Company Pledge Line
BMO Harris Bank	75,000		75,000		None	Secured Tri-Party Pledge Facility
BMO Harris Bank	150,000		150,000		None	Secured Depository Trust Company Pledge Line
Total	300,000		300,000
Revolving Credit Facility
BMO Harris Bank Canadian Imperial Bank of Commerce Texas Capital Bank	70,000		70,000		August 23, 2019	(Syndicated) Unsecured liquidity facility to cover increases in National Securities Clearing Corporation margin deposit requirements
Total Credit Lines	$	370,000	$	370,000