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Investment Securities (Narrative) (Details) - USD ($)
1 Months Ended 12 Months Ended
Feb. 14, 2020
Mar. 31, 2020
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]          
Long-term investments     $ 44,959,000 $ 53,073,000  
Proceeds from long-term equity method investment         $ 53,901,000
Proceeds from sale or liquidation of long-term investments     9,266,000 11,509,000 32,572,000
Other equity securities at cost     2,755,000 5,200,000  
Impairment or other adjustments related to observable price changes     0 0 0
Dividends received     $ 51,000 50,000  
Proceeds from long-term equity method investment, gross         54,089,000
Mutual fund and hedge funds | Minimum          
Debt Securities, Available-for-sale [Line Items]          
Equity method ownership percentage     6.45%    
Mutual fund and hedge funds | Maximum          
Debt Securities, Available-for-sale [Line Items]          
Equity method ownership percentage     38.34%    
Ladenburg Thalmann Financial Services Inc. | LTS Common Stock | Equity Method Investee | Common Stock          
Debt Securities, Available-for-sale [Line Items]          
Equity method ownership percentage 10.20%        
Investment Owned, Shares Sold, Price Per Share $ 3.50        
Proceeds from common shares of LTS $ 53,169,000        
Investment owned (in shares) 15,191,205        
Ladenburg Thalmann Financial Services Inc. | LTS Preferred | Equity Method Investee | Series A Cumulative Redeemable Preferred Stock          
Debt Securities, Available-for-sale [Line Items]          
Proceeds from common shares of LTS   $ 6,009,000      
Investment owned (in shares)   240,000      
Preferred stock dividend rate   8.00%      
Liquidation preference (in dollars per share)   $ 25.00      
Quoted Prices in Active Markets for Identical Assets (Level 1)          
Debt Securities, Available-for-sale [Line Items]          
Long-term investments     $ 514,000    
NAV          
Debt Securities, Available-for-sale [Line Items]          
Proceeds from long-term equity method investment     $ 4,971,000 11,642,000 32,572,000
Proceeds from sale or liquidation of long-term investments       $ 11,509,000 $ 32,676,000