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Investments - Debt Securities and Beneficial Interests (Details) - USD ($)
 9 Months Ended
Sep. 30, 2024
Jun. 30, 2024
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Dec. 31, 2022
Debt Securities, Held-to-Maturity, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract]            
HTM, allowance for expected credit losses $ 0   $ 0      
Basis 47,144,000   59,691,000      
Gross unrealized gains 0   111,000      
Gross unrealized losses (2,086,000)   (629,000)      
Fair value 45,058,000   59,173,000      
Equity Securities, FV-NI [Abstract]            
Basis 21,428,000          
Gross unrealized gains 490,000          
Gross unrealized losses 0          
Fair value 21,918,000          
Total Investments, basis 328,451,000   303,449,000      
Total Investments, gross unrealized gains 1,978,000   4,379,000      
Total Investments, gross unrealized losses (32,618,000)   (35,781,000)      
Total Investments, carrying value 297,811,000   272,047,000      
Debt securities available-for-sale, at fair value            
Debt Securities, Available-for-sale [Abstract]            
Basis 170,883,000   139,596,000      
Gross unrealized gains 819,000   637,000      
Gross unrealized losses (5,052,000)   (8,675,000)      
Fair value 166,650,000   131,558,000      
Investment in beneficial interests            
Debt Securities, Available-for-sale [Abstract]            
Debt securities, available-for-sale, allowance for credit loss 9,082,000 $ 9,082,000 6,880,000 $ 0 $ 0 $ 0
Basis 88,996,000   104,162,000      
Gross unrealized gains 669,000   3,631,000      
Gross unrealized losses (25,480,000)   (26,477,000)      
Fair value $ 64,185,000   $ 81,316,000