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Investments (Details) - USD ($)
3 Months Ended
Feb. 25, 2022
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Investments (at fair value):        
Amortized cost   $ 945,420,000   $ 917,412,000
Gross unrealized gains   12,083,000   15,217,000
Gross unrealized losses   (19,317,000)   (2,960,000)
Fair value   938,186,000   929,669,000
Equity securities        
Fair value   71,698,000   71,986,000
Total investments (at fair value)        
Fair value   1,009,884,000   1,001,655,000
Other Investments (not measured at fair value):        
Other debt securities - held-to-maturity   8,200,000   8,200,000
Total investments (not measured at fair value)   639,694,000   587,264,000
Total investments   1,649,578,000   1,588,919,000
Asset -backed securities unrealized loss position   640,600,000    
Asset -backed securities unrealized loss position not due to credit loss   0    
Private education loan asset-backed securities subject to repurchase agreements with third-parties   374,400,000    
Loss from ALLO voting membership interest investment   13,130,000 $ 22,219,000  
Equity securities, realized gain   2,117,000 2,321,000  
Net loss attributable to noncontrolling interests   1,761,000 694,000  
FFELP loan asset-backed debt securities - available-for-sale        
Investments (at fair value):        
Amortized cost   507,378,000   480,691,000
Gross unrealized gains   12,079,000   14,710,000
Gross unrealized losses   (2,388,000)   (719,000)
Fair value   517,069,000   494,682,000
Private education loan asset-backed debt securities - available-for-sale        
Investments (at fair value):        
Amortized cost   388,736,000   414,286,000
Gross unrealized gains   0   507,000
Gross unrealized losses   (16,851,000)   (2,241,000)
Fair value   371,885,000   412,552,000
Other debt securities - available-for-sale        
Investments (at fair value):        
Amortized cost   49,306,000   22,435,000
Gross unrealized gains   4,000   0
Gross unrealized losses   (78,000)   0
Fair value   49,232,000   22,435,000
Union Bank and Trust Company        
Other Investments (not measured at fair value):        
Amount of participation, student loan asset-backed securities   267,500,000    
Miscellaneous Investments        
Other Investments (not measured at fair value):        
Beneficial interest in securitizations   130,354,000   120,142,000
Venture capital and funds: | Miscellaneous Investments        
Other Investments (not measured at fair value):        
Measurement alternative   164,368,000   157,609,000
Equity method   74,339,000   67,840,000
Total investments (not measured at fair value)   238,707,000   225,449,000
Real estate: | Miscellaneous Investments        
Other Investments (not measured at fair value):        
Equity method   50,257,000   47,226,000
Notes receivable   4,169,000   0
Total investments (not measured at fair value)   54,426,000   47,226,000
Partnership Interest | Miscellaneous Investments        
Other Investments (not measured at fair value):        
Equity method   108,773,000   87,247,000
Preferred membership interest and accrued and unpaid preferred return   139,459,000   137,342,000
Total investments (not measured at fair value)   248,232,000   224,589,000
Additional equity investment $ 34,700,000      
Loss from ALLO voting membership interest investment   13,100,000 22,200,000  
Partnership Interest | Miscellaneous Investments | ALLO        
Other Investments (not measured at fair value):        
Preferred membership interest and accrued and unpaid preferred return   137,300,000    
Equity method investment, accrued and unpaid preferred return   2,100,000    
Beneficial interest in private education loan securitizations | Miscellaneous Investments        
Other Investments (not measured at fair value):        
Beneficial interest in securitizations   73,915,000   66,008,000
Loans corresponding to beneficial interest   680,000,000    
Consumer loans | Miscellaneous Investments        
Other Investments (not measured at fair value):        
Beneficial interest in securitizations   31,222,000   28,366,000
Loans corresponding to beneficial interest   190,000,000    
Beneficial interest in federally insured loan securitizations | Miscellaneous Investments        
Other Investments (not measured at fair value):        
Beneficial interest in securitizations   25,217,000   25,768,000
Loans corresponding to beneficial interest   450,000,000    
Solar        
Other Investments (not measured at fair value):        
Amount funded or committed to fund   231,400,000    
Amount funded or committed to fund by partners   62,600,000    
Equity method investment, amount committed to fund   19,000,000    
Equity method investment, amount committed to fund by partners   14,800,000    
Pre-tax loss from equity investment   1,000,000 1,700,000  
Net loss attributable to noncontrolling interests   $ 1,800,000 600,000  
Solar | Minimum        
Other Investments (not measured at fair value):        
Unrecognized tax benefits, resulting from prior period tax positions, period   5 years    
Solar | Maximum        
Other Investments (not measured at fair value):        
Unrecognized tax benefits, resulting from prior period tax positions, period   6 years    
Solar | Miscellaneous Investments        
Other Investments (not measured at fair value):        
Total investments (not measured at fair value)   $ (44,354,000)   (42,457,000)
Tax liens, affordable housing, and other | Miscellaneous Investments        
Other Investments (not measured at fair value):        
Total investments (not measured at fair value)   $ 4,129,000   $ 4,115,000
Preferred Partnership Interest | Miscellaneous Investments        
Other Investments (not measured at fair value):        
Equity method investment, preferred annual return   6.25%    
Equity securities, realized gain   $ 2,100,000 $ 2,300,000