CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Operating activities
Net income	$ 470,885,000	$ 781,408,000
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Provisions for credit losses	128,595,000	(156,090,000)
Income tax expense	151,652,000	256,699,000
Amortization of brokered deposit placement fee	6,575,000	8,194,000
Amortization of Secured Borrowing Facility upfront fee	1,218,000	1,486,000
Amortization of deferred loan origination costs and loan premium/(discounts), net	8,186,000	7,983,000
Net amortization of discount on investments	1,022,000	4,079,000
(Increase) reduction in tax indemnification receivable	(221,000)	5,649,000
Depreciation of premises and equipment	8,489,000	7,545,000
Acquired intangible assets amortization expense	3,150,000	0
Stock-based compensation expense	20,296,000	17,568,000
Unrealized (gains) losses on derivatives and hedging activities, net	(27,000)	17,809,000
Gains on sales of loans, net	(249,878,000)	(402,790,000)
Acquisition transaction costs, net	2,602,000	0
Other adjustments to net income, net	10,896,000	(31,210,000)
Changes in operating assets and liabilities:
Increase in accrued interest receivable	(372,454,000)	(369,343,000)
Increase in non-marketable securities	(992,000)	(8,611,000)
(Increase) decrease in other interest-earning assets	(528,000)	24,759,000
Increase in other assets	(39,862,000)	(96,253,000)
Decrease in income taxes payable, net	(118,724,000)	(232,124,000)
Decrease in accrued interest payable	(2,535,000)	(8,292,000)
Decrease in other liabilities	(25,846,000)	(8,399,000)
Total adjustments	(468,386,000)	(961,341,000)
Total net cash provided by (used in) operating activities	2,499,000	(179,933,000)
Investing activities
Loans acquired and originated	(2,857,411,000)	(2,628,056,000)
Net proceeds from sales of loans held for investment	2,333,188,000	3,436,085,000
Proceeds from FFELP Loan claim payments	14,642,000	9,275,000
Net decrease in loans held for investment (other than loan sales)	2,007,215,000	1,892,800,000
Purchases of available-for-sale securities	(753,129,000)	(505,004,000)
Proceeds from sales and maturities of available-for-sale securities	741,059,000	582,090,000
Purchase of subsidiary, net of cash acquired	(127,568,000)	0
Total net cash provided by investing activities	1,357,996,000	2,787,190,000
Financing activities
Brokered deposit placement fee	(3,790,000)	(713,000)
Net decrease in certificates of deposit	(1,131,940,000)	(2,312,940,000)
Net increase in other deposits	353,506,000	816,013,000
Borrowings collateralized by loans in securitization trusts - issued	0	529,253,000
Borrowings collateralized by loans in securitization trusts - repaid	(716,561,000)	(534,282,000)
Issuance costs for unsecured debt offering	(360,000)	(325,000)
Fees paid on Secured Borrowing Facility	(2,833,000)	(2,846,000)
Common stock dividends paid	(58,576,000)	(20,170,000)
Preferred stock dividends paid	(3,032,000)	(2,393,000)
Common stock repurchased	(545,498,000)	(1,027,298,000)
Total net cash used in financing activities	(2,109,084,000)	(2,555,701,000)
Net increase (decrease) in cash, cash equivalents and restricted cash	(748,589,000)	51,556,000
Cash, cash equivalents and restricted cash at beginning of period	4,545,344,000	4,609,709,000
Cash, cash equivalents and restricted cash at end of period	3,796,755,000	4,661,265,000
Cash disbursements made for:
Interest	174,681,000	192,939,000
Income taxes paid	120,330,000	232,285,000
Income taxes refunded	(2,023,000)	(1,049,000)
Reconciliation of the Consolidated Statements of Cash Flows to the Consolidated Balance Sheets:
Cash and cash equivalents	3,649,651,000	4,497,310,000
Restricted cash	147,104,000	163,955,000
Total cash, cash equivalents and restricted cash	$ 3,796,755,000	$ 4,661,265,000