CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Operating activities
Net income	$ 128,812,000	$ 641,207,000
Adjustments to reconcile net income to net cash provided by operating activities:
Provisions for credit losses	98,050,000	(225,767,000)
Income tax expense	37,356,000	203,525,000
Amortization of brokered deposit placement fee	3,425,000	4,307,000
Amortization of Secured Borrowing Facility upfront fee	569,000	773,000
Amortization of deferred loan origination costs and loan premium/(discounts), net	4,455,000	4,016,000
Net amortization of discount on investments	965,000	2,161,000
Reduction (increase) in tax indemnification receivable	(108,000)	2,814,000
Depreciation of premises and equipment	4,189,000	3,715,000
Acquired intangible assets amortization expense	733,000	0
Stock-based compensation expense	11,921,000	11,124,000
Unrealized (gains) losses on derivatives and hedging activities, net	315,000	10,872,000
Gains on sales of loans, net	(9,881,000)	(399,111,000)
Acquisition transaction costs, net	2,511,000	0
Other adjustments to net income, net	7,235,000	2,578,000
Changes in operating assets and liabilities:
Increase in accrued interest receivable	(185,294,000)	(183,168,000)
Increase in non-marketable securities	(992,000)	(317,000)
Decrease in other interest-earning assets	328,000	19,282,000
Increase in other assets	(17,529,000)	(51,667,000)
Decrease in income taxes payable, net	(4,243,000)	(270,000)
Increase (decrease) in accrued interest payable	14,779,000	(9,081,000)
Increase (decrease) in other liabilities	(34,808,000)	8,759,000
Total adjustments	(66,024,000)	(595,455,000)
Total net cash provided by operating activities	62,788,000	45,752,000
Investing activities
Loans acquired and originated	(2,215,958,000)	(2,076,635,000)
Net proceeds from sales of loans held for investment	45,729,000	3,436,391,000
Proceeds from FFELP Loan claim payments	5,594,000	4,602,000
Net decrease in loans held for investment (other than loan sales)	1,153,297,000	1,021,353,000
Purchases of available-for-sale securities	(536,633,000)	(200,716,000)
Proceeds from sales and maturities of available-for-sale securities	686,806,000	205,367,000
Purchase of subsidiary, net of cash acquired	(127,702,000)	0
Total net cash (used in) provided by investing activities	(988,867,000)	2,390,362,000
Financing activities
Brokered deposit placement fee	(2,207,000)	0
Net decrease in certificates of deposit	(127,815,000)	(686,344,000)
Net increase in other deposits	543,767,000	850,408,000
Borrowings collateralized by loans in securitization trusts - repaid	(381,005,000)	(272,123,000)
Issuance costs for unsecured debt offering	(360,000)	(325,000)
Fees paid on Secured Borrowing Facility	0	(2,833,000)
Common stock dividends paid	(30,493,000)	(10,906,000)
Preferred stock dividends paid	(1,275,000)	(1,201,000)
Common stock repurchased	(169,322,000)	(550,790,000)
Total net cash used in financing activities	(168,710,000)	(674,114,000)
Net increase (decrease) in cash, cash equivalents and restricted cash	(1,094,789,000)	1,762,000,000
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	3,450,555,000	6,371,709,000
Cash disbursements made for:
Interest	68,458,000	76,491,000
Income taxes paid	5,066,000	887,000
Income taxes refunded	(916,000)	(1,049,000)
Reconciliation of the Consolidated Statements of Cash Flows to the Consolidated Balance Sheets:
Cash and cash equivalents	3,262,595,000	6,207,001,000
Restricted cash	187,960,000	164,708,000
Total cash, cash equivalents and restricted cash	$ 3,450,555,000	$ 6,371,709,000