CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Operating activities
Net income	$ 339,964	$ 241,931
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Provisions for credit losses	187,245	130,441
Income tax expense	27,404	136,341
Amortization of brokered deposit placement fee	9,378	6,831
Amortization of ABCP Facility upfront fee	851	995
Amortization of deferred loan origination costs and loan premium/(discounts), net	8,039	6,122
Net amortization of discount on investments	1,344	1,504
Reduction of tax indemnification receivable	86,079	311
Depreciation of premises and equipment	9,977	8,194
Amortization of acquired intangibles	276	351
Stock-based compensation expense	25,828	21,773
Unrealized losses on derivatives and hedging activities, net	6,065	6,931
Gains on sales of loans, net	(2,060)	0
Losses on sales of securities, net	1,549	0
Other adjustments to net income, net	5,428	4,601
Changes in operating assets and liabilities:
Increase in accrued interest receivable	(628,959)	(506,451)
(Increase) decrease in other interest-earning assets	(10,485)	17,811
Decrease in tax indemnification receivable	26,991	44,725
Increase in other assets	(60,903)	(53,275)
Decrease in income taxes payable, net	(156,502)	(217,235)
Increase in accrued interest payable	27,265	15,240
Decrease in payable due to entity that is a subsidiary of Navient	(676)	(305)
Increase in other liabilities	3,502	6,143
Total adjustments	(432,364)	(368,952)
Total net cash used in operating activities	(92,400)	(127,021)
Investing activities
Loans acquired and originated	(5,570,195)	(4,314,711)
Net proceeds from sales of loans held for investment	44,832	5,497
Proceeds from claim payments	38,492	34,759
Net decrease in loans held for investment	2,208,681	1,488,087
Purchases of available-for-sale securities	(7,914)	(55,569)
Proceeds from sales and maturities of available-for-sale securities	70,843	29,452
Total net cash used in investing activities	(3,215,261)	(2,812,485)
Financing activities
Brokered deposit placement fee	(25,104)	(9,668)
Net increase in certificates of deposit	1,953,644	1,087,486
Net increase in other deposits	458,472	516,343
Borrowings collateralized by loans in securitization trusts - issued	1,890,912	767,245
Borrowings collateralized by loans in securitization trusts - repaid	(639,190)	(397,106)
Issuance costs for unsecured debt offering	0	(1,057)
Unsecured debt issued	0	197,000
Borrowings under ABCP Facility	300,000	300,000
Repayment of borrowings under ABCP Facility	(300,000)	0
Fees paid on ABCP Facility	(1,095)	(1,281)
Redemption of Preferred Stock Series A	0	(165,000)
Preferred stock dividends paid	(11,441)	(12,577)
Net cash provided by financing activities	3,626,198	2,281,385
Net increase (decrease) in cash, cash equivalents and restricted cash	318,537	(658,121)
Cash, cash equivalents and restricted cash at beginning of period	1,636,175	1,972,510
Cash, cash equivalents and restricted cash at beginning of period	1,954,712	1,314,389
Cash disbursements made for:
Interest	327,798	191,488
Income taxes paid	161,248	216,321
Income taxes refunded	(5,174)	(986)
Reconciliation of the Consolidated Statements of Cash Flows to the Consolidated Balance Sheets:
Total cash, cash equivalents and restricted cash	$ 1,636,175	$ 1,972,510