XML 80 R62.htm IDEA: XBRL DOCUMENT v3.20.4
Significant Accounting Policies - Effect of CECL Adoption (Details) - USD ($)
$ in Thousands
Jan. 01, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Allowance for credit losses on loans and leases   $ 1,361,723 $ 441,912 $ 341,121 $ 251,475
Off-balance sheet exposures   86,000 2,481    
Retained earnings   1,722,365 1,850,512    
Accounting Standards Update 2016-13          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Allowance for credit losses on loans and leases $ 1,100,000        
Deferred tax asset 306,000        
Off-balance sheet exposures $ 116,000        
Period of deferment 2 years        
Deferred tax asset          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Deferred tax asset     109,369    
Private Education Loans          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Allowance for credit losses on loans and leases   1,355,844 374,300    
FFELP Loans          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Allowance for credit losses on loans and leases   4,378 1,633    
Personal Loans          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Allowance for credit losses on loans and leases   0 65,877    
Credit Cards          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Allowance for credit losses on loans and leases   $ 1,501 102    
Cumulative Effect, Period Of Adoption, Adjusted Balance          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Allowance for credit losses on loans and leases $ 1,584,965        
Off-balance sheet exposures 118,239        
Retained earnings 897,873        
Cumulative Effect, Period Of Adoption, Adjusted Balance | Deferred tax asset          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Deferred tax asset 415,540        
Cumulative Effect, Period Of Adoption, Adjusted Balance | Private Education Loans          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Allowance for credit losses on loans and leases 1,435,130        
Cumulative Effect, Period Of Adoption, Adjusted Balance | FFELP Loans          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Allowance for credit losses on loans and leases 4,485        
Cumulative Effect, Period Of Adoption, Adjusted Balance | Personal Loans          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Allowance for credit losses on loans and leases 145,060        
Cumulative Effect, Period Of Adoption, Adjusted Balance | Credit Cards          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Allowance for credit losses on loans and leases 290        
Cumulative Effect, Period of Adoption, Adjustment          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Allowance for credit losses on loans and leases 1,143,053   $ 1,584,965    
Off-balance sheet exposures 115,758        
Retained earnings (952,639)        
Cumulative Effect, Period of Adoption, Adjustment | Deferred tax asset          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Deferred tax asset 306,171        
Cumulative Effect, Period of Adoption, Adjustment | Private Education Loans          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Allowance for credit losses on loans and leases 1,060,830        
Cumulative Effect, Period of Adoption, Adjustment | FFELP Loans          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Allowance for credit losses on loans and leases 2,852        
Cumulative Effect, Period of Adoption, Adjustment | Personal Loans          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Allowance for credit losses on loans and leases 79,183        
Cumulative Effect, Period of Adoption, Adjustment | Credit Cards          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Allowance for credit losses on loans and leases $ 188