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Investments - Available-for-sale (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]    
Gross unrealized gains $ 1,900 $ 1,200
Gross unrealized losses (200) (800)
Interest receivable on securities 300 200
Debt securities    
Debt Securities, Available-for-sale [Line Items]    
Basis 422,981 273,459
Gross unrealized gains 1,877 1,152
Gross unrealized losses (226) (777)
Carrying value (fair value) 424,632 273,834
Beneficial interests in securitization trusts    
Debt Securities, Available-for-sale [Line Items]    
Basis 133,484 91,418
Gross unrealized gains 0 0
Gross unrealized losses 0 0
Carrying value (fair value) 133,484 91,418
Accumulated net investment gain (loss) attributable to noncontrolling interest    
Debt Securities, Available-for-sale [Line Items]    
Basis 556,465 364,877
Gross unrealized gains 1,877 1,152
Gross unrealized losses (226) (777)
Carrying value (fair value) $ 558,116 $ 365,252