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Fair Value - Assets and Liabilities that are Measured at Fair Value (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Financial assets:    
Fair value $ 749,950 $ 390,648
Total assets 749,950 390,648
Equity securities - trading 14,800  
Equity securities, available-for-sale 19,800  
FFELP loan asset-backed debt securities - available-for-sale    
Financial assets:    
Fair value 371,433 346,502
Private education loan asset-backed debt securities - available-for-sale    
Financial assets:    
Fair value 307,293 0
Other debt securities - available-for-sale    
Financial assets:    
Fair value 2,101 2,105
Equity securities    
Financial assets:    
Fair value 34,550 10,114
Equity securities measured at net asset value    
Financial assets:    
Fair value 34,573 31,927
Level 1    
Financial assets:    
Fair value 34,650 10,217
Total assets 34,650 10,217
Level 1 | FFELP loan asset-backed debt securities - available-for-sale    
Financial assets:    
Fair value 0 0
Level 1 | Private education loan asset-backed debt securities - available-for-sale    
Financial assets:    
Fair value 0 0
Level 1 | Other debt securities - available-for-sale    
Financial assets:    
Fair value 100 103
Level 1 | Equity securities    
Financial assets:    
Fair value 34,550 10,114
Level 2    
Financial assets:    
Fair value 680,727 348,504
Total assets 680,727 348,504
Level 2 | FFELP loan asset-backed debt securities - available-for-sale    
Financial assets:    
Fair value 371,433 346,502
Level 2 | Private education loan asset-backed debt securities - available-for-sale    
Financial assets:    
Fair value 307,293 0
Level 2 | Other debt securities - available-for-sale    
Financial assets:    
Fair value 2,001 2,002
Level 2 | Equity securities    
Financial assets:    
Fair value $ 0 $ 0