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Other Assets - Retained Interest Investments (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Investments    
Retained interest investments $ 14,073 $ 13,826
Retained interest investments    
Investments    
Expected amount to receive upon maturity of note after payment of note and any other liabilities $ 16,900  
Promissory notes maturity period 15 years  
Retained interest investments $ 14,100 $ 13,800
Minimum | Retained interest investments    
Investments    
Notes maturity year 2022  
Maximum | Retained interest investments    
Investments    
Notes maturity year 2024