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Variable Interest Entities (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2021
Dec. 31, 2023
Variable Interest Entity [Line Items]      
Percentage of beneficial interests in securitized assets (in percent)   5.00%  
Fair value of investment securities pledged $ 106,200    
Investment securities at fair value, pledged 108,323   $ 110,352
Borrowings against investment securities $ 94,064   $ 93,814
Minimum | Secured Debt      
Variable Interest Entity [Line Items]      
Maturity period (in months) 1 month    
Maximum | Secured Debt      
Variable Interest Entity [Line Items]      
Maturity period (in months) 2 months    
Holdings, LLC      
Variable Interest Entity [Line Items]      
Ownership percentage (in percent) 100.00%