Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
CASH FLOWS FROM OPERATING ACTIVITIES:
Net (loss) income	$ (1,674,150)	$ 270,345
Adjustments to reconcile net income to net cash used in operating activities:
Goodwill impairment	1,784,936	0
Amortization of investment premiums, net	20,911	19,592
(Gain) loss on sale of investment securities, net	(190)	7,186
Provision for credit losses	204,832	56,263
Change in cash surrender value of bank owned life insurance	(6,433)	(6,365)
Depreciation, amortization and accretion	28,494	33,126
Gain on sale of premises and equipment	(369)	(1,568)
Gain on store divestiture	(5,945)	(1,225)
Increase In Mortgage Servicing Rights Carried At Fair Value	(37,484)	(16,772)
Change in fair value of residential mortgage servicing rights carried at fair value	59,246	34,414
Stock-based compensation	6,781	5,826
Net increase in equity and other investments	(1,662)	(1,217)
Gain on equity securities, net	(942)	(83,559)
Gain on sale of loans and leases, net	(212,353)	(65,707)
Change in fair value of loans held for sale	(16,519)	(5,758)
Origination of loans held for sale	(4,897,068)	(2,029,682)
Proceeds from sales of loans held for sale	4,958,265	1,906,722
Change in other assets and liabilities:
Net increase in other assets	(231,781)	(179,316)
Net decrease in other liabilities	(59,519)	(20,180)
Net cash used in operating activities	(80,950)	(77,875)
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of investment securities available for sale	(595,396)	(563,606)
Proceeds from investment securities available for sale	604,553	778,259
Proceeds from investment securities held to maturity	319	432
Proceeds from sale of equity securities	0	81,853
Purchases of restricted equity securities	(20,001)	(220,200)
Redemption of restricted equity securities	16,402	206,005
Net change in loans and leases	(1,343,715)	(1,229,379)
Proceeds from sales of loans and leases	60,777	88,776
Change in premises and equipment	(11,526)	(8,230)
Proceeds from bank owned life insurance death benefits	57	1,869
Net cash paid in store divestiture	(81,172)	(44,646)
Net cash used in investing activities	(1,369,702)	(908,867)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net increase in deposit liabilities	2,288,262	1,347,046
Net increase in securities sold under agreements to repurchase	76,720	(434)
Proceeds from borrowings	600,000	810,670
Repayment of borrowings	(510,000)	(455,670)
Dividends paid on common stock	(138,731)	(138,856)
Proceeds from stock options exercised	0	21
Repurchase and retirement of common stock	(8,628)	(7,228)
Net cash provided by financing activities	2,307,623	1,555,549
Net increase in cash and cash equivalents	856,971	568,807
Cash and cash equivalents, beginning of period	1,362,756	622,637
Cash and cash equivalents, end of period	2,219,727	1,191,444
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Interest	115,016	155,232
Income taxes	105,579	107,933
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES:
Changes in unrealized gains and losses on investment securities available for sale, net of taxes	85,523	79,900
Changes in unrealized gains and losses on junior subordinated debentures carried at fair value, net of taxes	19,950	23,978
Cumulative effect adjustment to retained earnings	40,181	244
Cash dividend declared on common stock and payable after period-end	0	46,245
Transfer of loans to loans held for sale	6,187	0
Change in GNMA mortgage loans recognized due to repurchase option	$ 15,617	$ (3,690)