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Investments - Summary of Private Debt and Equity (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2023
USD ($)
note
Mar. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
project
Jun. 30, 2022
USD ($)
Jun. 30, 2023
USD ($)
note
Jun. 30, 2022
USD ($)
Net Investment Income [Line Items]            
Carrying Value $ 27,415   $ 27,447   $ 27,415  
Investment Income 232     $ (489) 1,823 $ 2,410
Proceeds from sales         1,153 0
Renewable energy LLCs            
Net Investment Income [Line Items]            
Carrying Value 8,849   $ 9,159   8,849  
Investment Income (305)     96 868 2,620
Number of underlying projects sold | project     2      
Proceeds from sales   $ 1,200        
Renewable energy notes receivable            
Net Investment Income [Line Items]            
Carrying Value 2,705   $ 2,705   2,705  
Investment Income 81     157 162 314
Limited partnerships            
Net Investment Income [Line Items]            
Carrying Value 11,361   11,083   11,361  
Investment Income 370     (828) 621 (696)
Bank holding companies            
Net Investment Income [Line Items]            
Carrying Value 4,500   4,500   4,500  
Investment Income 86     86 172 172
Excess and Surplus Lines            
Net Investment Income [Line Items]            
Carrying Value 24,848   24,880   24,848  
Investment Income 187     (591) 1,563 1,977
Excess and Surplus Lines | Renewable energy LLCs            
Net Investment Income [Line Items]            
Carrying Value 8,849   9,159   8,849  
Investment Income $ (305)     81 698 2,361
Proceeds from sales   984        
Excess and Surplus Lines | Renewable energy LLCs | Investment in LLC            
Net Investment Income [Line Items]            
Cash distributions from LLCs         $ 24,000 951,000
Excess and Surplus Lines | Renewable energy LLCs | Minimum | Investment in LLC | Various LLCs            
Net Investment Income [Line Items]            
Ownership percentage 2.60%       2.60%  
Excess and Surplus Lines | Renewable energy LLCs | Maximum | Investment in LLC | Various LLCs            
Net Investment Income [Line Items]            
Ownership percentage 4.90%       4.90%  
Excess and Surplus Lines | Renewable energy notes receivable            
Net Investment Income [Line Items]            
Carrying Value $ 1,202   1,202   $ 1,202  
Investment Income $ 36     70 $ 72 140
Number of notes issued | note 2       2  
Rate of interest 12.00%       12.00%  
Excess and Surplus Lines | Limited partnerships            
Net Investment Income [Line Items]            
Carrying Value $ 10,297   10,019   $ 10,297  
Investment Income 370     (828) 621 (696)
Outstanding commitments to invest 5,000       5,000  
Newly acquired limited partnership 20,000       20,000  
Excess and Surplus Lines | Bank holding companies            
Net Investment Income [Line Items]            
Carrying Value 4,500   4,500   4,500  
Investment Income $ 86     86 $ 172 172
Rate of interest 7.60%       7.60%  
Investment in private subordinated notes $ 4,500       $ 4,500  
Corporate and Other            
Net Investment Income [Line Items]            
Carrying Value 2,567   2,567   2,567  
Investment Income 45     102 260 433
Corporate and Other | Renewable energy LLCs            
Net Investment Income [Line Items]            
Carrying Value 0   0   0  
Investment Income 0     15 170 259
Proceeds from sales   $ 170        
Corporate and Other | Renewable energy LLCs | Investment in LLC            
Net Investment Income [Line Items]            
Cash distributions from LLCs           951,000
Corporate and Other | Renewable energy notes receivable            
Net Investment Income [Line Items]            
Carrying Value 1,503   1,503   1,503  
Investment Income $ 45     87 $ 90 174
Number of notes issued | note 2       2  
Rate of interest 12.00%       12.00%  
Corporate and Other | Limited partnerships            
Net Investment Income [Line Items]            
Carrying Value $ 1,064   1,064   $ 1,064  
Investment Income 0     0 0 0
Corporate and Other | Bank holding companies            
Net Investment Income [Line Items]            
Carrying Value 0   $ 0   0  
Investment Income $ 0     $ 0 $ 0 $ 0