Equity Method Investment in Related Party (Schedule of Consolidated Statements of Operations and Financial Condition) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]
Revenue	$ 67,507,000	$ 54,872,000
Assets	1,404,235,000	1,372,987,000
Liabilities	1,353,729,000	1,335,001,000
Stockholders' Equity	49,263,000	37,986,000
Tigress Holdings, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Revenue	15,000,000	9,900,000
Operating income	4,800,000	3,100,000
Assets	28,400,000	22,200,000
Liabilities	6,100,000	5,800,000
Stockholders' Equity	$ 22,300,000	$ 16,400,000