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Loans Receivable and Allowance for Loan Losses - Activity in the Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period $ 62,591 $ 53,715 $ 60,388 $ 54,590
Provision for loan losses 10,000 10,500 26,000 18,000
Charge-offs (6,598) (4,148) (19,580) (13,875)
Recoveries 424 150 1,109 502
Loan sale and other 0 0 (1,500) 1,000
Balance at end of period 66,417 60,217 66,417 60,217
Federally insured loans        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 39,056 37,263 42,310 38,706
Provision for loan losses 2,000 8,000 6,000 12,000
Charge-offs (3,380) (2,210) (10,634) (8,653)
Recoveries 0 0 0 0
Loan sale and other 0 0 0 1,000
Balance at end of period 37,676 43,053 37,676 43,053
Private education loans        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 10,157 11,664 10,838 12,629
Provision for loan losses 0 0 0 0
Charge-offs (459) (535) (1,529) (1,846)
Recoveries 184 124 573 470
Loan sale and other 0 0 0 0
Balance at end of period 9,882 11,253 9,882 11,253
Consumer loans        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 13,378 4,788 7,240 3,255
Provision for loan losses 8,000 2,500 20,000 6,000
Charge-offs (2,759) (1,403) (7,417) (3,376)
Recoveries 240 26 536 32
Loan sale and other 0 0 (1,500) 0
Balance at end of period $ 18,859 $ 5,911 $ 18,859 $ 5,911