CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Operating activities
Net income	$ 6,113	$ 247,595
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	226,000	58,000
Depreciation and amortization	51,716	26,085
Net (gain)/loss on sale of loans held for sale	(51,265)	12,502
Increase in valuation allowance on mortgage servicing rights	20,933	8,360
Stock-based compensation expense	12,064	12,973
Purchases and originations of loans held for sale	(8,963,499)	(7,288,823)
Proceeds from sales and repayments of loans held for sale	10,859,458	6,534,879
Changes in operating assets and liabilities:
Accrued interest receivable and other assets	(16,912)	(156,803)
Accrued interest payable and other liabilities	25,222	115,636
Net cash provided by/(used in) operating activities	2,169,830	(429,596)
Investing activities
Purchases of investment securities	(1,140,935)	(111,131)
Principal payments received on investment securities	12,042	5,534
Originations of mortgage finance loans	(157,016,926)	(99,799,613)
Proceeds from pay-offs of mortgage finance loans	155,808,671	97,725,705
Net decrease/(increase) in loans held for investment, excluding mortgage finance loans	553,026	(143,741)
Purchase of premises and equipment, net	(2,705)	(15,047)
Proceeds from sale of other real estate owned, net	0	79
Net cash used in investing activities	(1,786,827)	(2,338,214)
Financing activities
Net increase in deposits	5,480,894	6,807,190
Costs from issuance of stock related to stock-based awards and warrants	(1,798)	(1,655)
Preferred dividends paid	(7,313)	(7,313)
Net increase/(decrease) in other borrowings	300,000
Net increase/(decrease) in other borrowings		(1,400,000)
Net increase/(decrease) in federal funds purchased and repurchase agreements	66,417	(501,207)
Net cash provided by financing activities	5,838,200	4,897,015
Net increase in cash and cash equivalents	6,221,203	2,129,205
Cash and cash equivalents at beginning of period	4,425,583	3,080,065
Cash and cash equivalents at end of period	10,646,786	5,209,270
Supplemental disclosures of cash flow information:
Cash paid during the period for interest	154,019	282,559
Cash paid during the period for income taxes	$ 21,747	$ 85,314