CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Operating Activities
Net income	$ 189,017	$ 99,568
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Provision for credit losses	100,575	279
Depreciation, amortization and accretion, net	8,111	(1,612)
Net change in fair value of equity securities	44	(16)
Deferred income taxes	742	1,824
Other, net	600	5,168
Net change in securities purchased under agreements to resell	(102,426)	10,951
Net change in trading securities	41,539	143,942
Net change in broker-dealer and clearing organization receivables	711,290	(258,976)
Net change in other assets	(136,942)	(5,525)
Net change in broker-dealer and clearing organization payables	(364,631)	138,310
Net change in other liabilities	30,443	(11,544)
Net change in securities sold, not yet purchased	11,523	(36,220)
Proceeds from sale of mortgage servicing rights asset	18,650
Net gains from sales of loans	(445,803)	(227,312)
Loans originated for sale	(11,035,100)	(6,783,246)
Proceeds from loans sold	10,870,200	6,790,418
Net cash used in operating activities for continuing operations	(102,168)	(133,991)
Net cash provided by (used in) operating activities for discontinued operations	(28,533)	3,357
Net cash used in operating activities	(130,701)	(130,634)
Investing Activities
Proceeds from maturities and principal reductions of securities held to maturity	49,918	25,726
Proceeds from sales, maturities and principal reductions of securities available for sale	194,336	67,064
Purchases of securities held to maturity	(7,080)	(40,789)
Purchases of securities available for sale	(357,307)	(191,108)
Net change in loans held for investment	(632,976)	(267,006)
Purchases of premises and equipment and other assets	(21,005)	(14,935)
Proceeds from sales of premises and equipment and other real estate owned	17,591	9,777
Net cash received from (paid to) Federal Home Loan Bank and Federal Reserve Bank stock	22,905	(11,301)
Net cash used in investing activities for continuing operations	(733,618)	(422,572)
Net cash provided by investing activities for discontinued operations	1,941	11,635
Net cash received from disposal of discontinued operations	84,763
Net cash used in investing activities	(646,914)	(410,937)
Financing Activities
Net change in deposits	2,535,125	25,579
Net change in short-term borrowings	(703,846)	273,086
Proceeds from notes payable	860,484	365,270
Payments on notes payable	(666,681)	(362,255)
Payments to repurchase common stock	(15,249)	(24,980)
Dividends paid on common stock	(16,279)	(14,983)
Net cash distributed to noncontrolling interest	(6,889)	(2,870)
Taxes paid on employee stock awards netting activity	(1,025)	(1,734)
Other, net	(311)	(215)
Net cash provided by financing activities	1,985,329	256,898
Net change in cash, cash equivalents and restricted cash	1,207,714	(284,673)
Cash, cash equivalents and restricted cash, beginning of period	642,789	778,466
Cash, cash equivalents and restricted cash, end of period	1,850,503	493,793
Supplemental Disclosures of Cash Flow Information
Cash paid for interest	64,621	80,880
Cash paid for income taxes, net of refunds	5,976	12,504
Supplemental Schedule of Non-Cash Activities
Derecognition of construction in progress related to build-to-suit lease obligations		29,195
Conversion of loans to other real estate owned	12,455	2,931
Additions to mortgage servicing rights	$ 63,915	$ 4,408