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Allowance for Loan Losses Allowance for Loan Losses - Loan Status of Private Education Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Allowance	$ 341,121	$ 251,475	$ 184,701	$ 112,507
Consumer Portfolio Segment | Student Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans in in-school/grace/deferment	5,260,445	4,757,732	4,189,955
Loans in forbearance	577,164	468,402	351,962
Loans current	$ 14,289,705	$ 11,911,128	$ 9,509,394
Loans current, in percentage	97.40%	97.60%	97.90%
Total TDR loans in repayment	$ 14,666,856	$ 12,206,033	$ 9,709,758
Loans in repayment, in percentage	100.00%	100.00%	100.00%
Loans Gross	$ 20,504,465	$ 17,432,167	$ 14,251,675
Net Unamortized Premium Or Discount	68,321	56,378	44,206
Loans	20,572,786	17,488,545	14,295,881
Loans and Leases Receivable, Allowance	277,943	243,715	182,472
Loans Receivable, Net	$ 20,294,843	$ 17,244,830	$ 14,113,409
Percentage Of Loans In Repayment	71.50%	70.00%	68.10%
Delinquencies As Percentage Of Loans In Repayment	2.60%	2.40%	2.10%
Loans In Forbearance As Percentage Of Loans In Repayment And Forbearance	3.80%	3.70%	3.50%
Loans delinquent 31-60 days | Consumer Portfolio Segment | Student Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans delinquent	$ 231,216	$ 179,002	$ 124,773
Loans delinquent (in percentage)	1.60%	1.50%	1.30%
Loans delinquent 61-90 days | Consumer Portfolio Segment | Student Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans delinquent	$ 95,105	$ 78,292	$ 51,423
Loans delinquent (in percentage)	0.70%	0.60%	0.50%
Loans delinquent greater than 90 days | Consumer Portfolio Segment | Student Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans delinquent	$ 50,830	$ 37,611	$ 24,168
Loans delinquent (in percentage)	0.30%	0.30%	0.30%

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