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Securities - Asset-backed Securities (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Asset-backed securities    
Amortized Cost $ 470,719 $ 391,694
Fair Value $ 456,066 385,486
Asset-backed securities    
Asset-backed securities    
Percentage of original principal amount of the loans made under FFEL which is guaranteed by the U.S. Department of Education 97.00%  
Amortized Cost $ 241,872 175,565
Fair Value 231,908 $ 173,496
Credit Concentration Risk | Stockholders' Equity | Access Group | Asset-backed securities    
Asset-backed securities    
Amortized Cost 73,293  
Fair Value 70,254  
Credit Concentration Risk | Stockholders' Equity | Northstar Education Finance | Asset-backed securities    
Asset-backed securities    
Amortized Cost 23,359  
Fair Value 23,291  
Credit Concentration Risk | Stockholders' Equity | GCO Education Loan Funding Corp | Asset-backed securities    
Asset-backed securities    
Amortized Cost 37,508  
Fair Value $ 35,263  
Minimum | Credit Concentration Risk | Stockholders' Equity | Access Group | Asset-backed securities    
Asset-backed securities    
Credit risk as a percentage of benchmark 10.00%  
Minimum | Credit Concentration Risk | Stockholders' Equity | Northstar Education Finance | Asset-backed securities    
Asset-backed securities    
Credit risk as a percentage of benchmark 10.00%  
Minimum | Credit Concentration Risk | Stockholders' Equity | GCO Education Loan Funding Corp | Asset-backed securities    
Asset-backed securities    
Credit risk as a percentage of benchmark 10.00%