CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Operating activities
Net income	$ 180,085	$ 184,439
Adjustments to reconcile net income to net cash used in operating activities:
Provisions for credit losses	116,179	59,673
Income tax expense	120,987	109,865
Amortization of brokered deposit placement fee	7,766	8,006
Amortization of ABCP Facility upfront fee	866	1,790
Amortization of deferred loan origination costs and fees, net	4,304	2,563
Net amortization of discount on investments	1,387	1,332
Interest income on tax indemnification receivable	(14,386)	(5,118)
Depreciation of premises and equipment	6,896	5,427
Amortization of acquired intangibles	747	1,110
Stock-based compensation expense	17,950	16,423
Unrealized gains on derivative and hedging activities, net	(1,881)	(1,985)
Gains on sale of loans, net	0	(76,874)
Other adjustments to net income, net	2,540	216
Changes in operating assets and liabilities:
Net decrease in loans held for sale	0	55
Origination of loans held for sale	0	(55)
Increase in accrued interest receivable	(430,441)	(316,263)
Decrease (increase) in restricted cash and investments - other	1,564	(2,596)
Decrease in other interest-earning assets	7,562	24,875
Decrease in tax indemnification receivable	44,725	44,725
Increase in other assets	(22,879)	(18,022)
Decrease in income taxes payable, net	(201,338)	(176,172)
Increase in accrued interest payable	10,202	7,227
Increase (decrease) in payable due to entity that is a subsidiary of Navient	658	(5,368)
Increase in other liabilities	7,131	5,895
Total adjustments	(319,461)	(313,271)
Total net cash used in operating activities	(139,376)	(128,832)
Investing activities
Loans acquired and originated	(4,072,631)	(3,786,946)
Net proceeds from sales of loans held for investment	7,912	790,094
Proceeds from claim payments	49,742	91,000
Net decrease in loans held for investment	953,715	672,665
Increase in restricted cash and investments - variable interest entities	(11,840)	(18,205)
Purchases of available-for-sale securities	(40,767)	(50,062)
Proceeds from sales and maturities of available-for-sale securities	26,318	26,222
Total net cash used in investing activities	(3,087,551)	(2,275,232)
Financing activities
Brokered deposit placement fee	(3,953)	(477)
Net increase in certificates of deposit	481,623	161,096
Net increase (decrease) in other deposits	961,123	(129,412)
Issuance costs for collateralized borrowings	(1,351)	0
Borrowings collateralized by loans in securitization trusts - issued	1,104,551	620,681
Borrowings collateralized by loans in securitization trusts - repaid	(106,567)	(27,195)
Borrowings under ABCP Facility	376,325	713,746
Repayment of borrowings under ABCP Facility	(526,500)	(3,741)
Fees paid on ABCP Facility	(1,450)	(104)
Excess tax (expense) benefit from the exercise of stock-based awards	(2,457)	6,093
Preferred stock dividends paid	(15,698)	(14,606)
Net cash provided by financing activities	2,265,646	1,326,081
Net decrease in cash and cash equivalents	(961,281)	(1,077,983)
Cash and cash equivalents at beginning of period	2,416,219	2,359,780
Cash and cash equivalents at end of period	1,454,938	1,281,797
Cash disbursements made for:
Interest	119,812	79,917
Income taxes paid	201,218	171,194
Income taxes received	$ (86)	$ (80)