Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Operating Activities
Net income	$ 142,077	$ 120,804
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	25,638	55,534
Depreciation, amortization, and accretion, net	39,524	46,513
Deferred income tax expense	74,940	64,101
Decrease in interest receivable	1,459	8,229
Decrease in interest payable	(1,575)	(3,207)
Increase in trading account assets	(6,592)	(6,261)
Originations of mortgage loans held for sale	(579,139)	(749,437)
Proceeds from sales of mortgage loans held for sale	561,796	893,348
Gains on sales of mortgage loans held for sale	(8,971)	(10,789)
(Increase) decrease in fair value of mortgage loans held for sale	(969)	3,838
Decrease in other assets	1,392	36,138
Increase (decrease) in accrued salaries and benefits	6,772	(4,584)
Increase in other liabilities	14,934	333
Investment securities gains, net	(1,331)	(2,571)
Losses on sales of other loans held for sale, net	2,050	487
Losses and write-downs on other real estate, net	16,734	22,714
Share-based compensation expense	7,453	5,771
Write-downs on other assets held for sale	7,608	0
Gain on sale of Memphis branches, net	(5,789)	0
Gain on sale of branch property	(3,116)	0
Net cash provided by operating activities	294,895	480,961
Investing Activities
Net cash (used) received in dispositions/acquisitions	(90,571)	56,328
Net decrease in interest earning deposits with banks	10,713	9,382
Net decrease in federal funds sold and securities purchased under resale agreements	10,057	33,340
Net (increase) decrease in interest bearing funds with Federal Reserve Bank	(105,918)	531,955
Proceeds from maturities and principal collections of investment securities available for sale	417,704	584,810
Proceeds from sales of investment securities available for sale	20,815	403,792
Purchases of investment securities available for sale	(277,375)	(1,197,122)
Proceeds from sales of loans	44,001	75,359
Proceeds from sale of other real estate	49,754	77,168
Principal repayments by borrowers on other loans held for sale	770	3,966
Net increase in loans	(754,930)	(423,252)
Purchases of premises and equipment	(36,059)	(24,971)
Proceeds from disposals of premises and equipment	4,838	3,172
Proceeds from sale of other assets held for sale	507	1,085
Net cash (used in) provided by investing activities	(705,694)	135,012
Financing Activities
Net increase (decrease) in demand and savings deposits	8,677	(281,267)
Net increase in certificates of deposit	295,687	141,252
Net decrease in federal funds purchased and securities sold under repurchase agreements	(40,972)	(6,630)
Principal repayments on long-term debt	(605)	(301,431)
Proceeds from issuance of long-term debt	99,938	462,500
Dividends paid to common shareholders	(29,194)	(26,703)
Dividends paid to preferred shareholders	(7,678)	(33,741)
Stock options exercised	1,985	789
Proceeds from issuance of Series C Preferred Stock	0	125,400
Redemption of Series A Preferred Stock	0	(967,870)
Proceeds from issuance of common stock	0	174,764
Excess tax benefit from share-based compensation	201	569
Restricted stock activity	(468)	(3,541)
Net cash provided by (used in) financing activities	327,571	(715,909)
Decrease in cash and cash equivalents	(83,228)	(99,936)
Cash and cash equivalents at beginning of period	469,630	614,630
Cash and cash equivalents at end of period	386,402	514,694
Supplemental Cash Flow Information
Income tax payments, net	4,693	1,669
Interest paid	83,861	85,332
Non-cash Investing Activities:
Mortgage loans held for sale transferred to loans at fair value	334	14,471
Premises and equipment transferred to other assets held for sale	16,613	490
Loans foreclosed and transferred to other real estate	35,495	72,854
Loans transferred to other loans held for sale at fair value	36,736	117,806
Other loans held for sale transferred to loans at fair value	0	1,235
Other loans held for sale foreclosed and transferred to other real estate at fair value	0	3,246
Settlement of prepaid common stock purchase contracts	0	122,848
Securities purchased during the period but settled after period-end	0	35,160
Dispositions/Acquisitions:
Fair value of non-cash assets (sold) acquired	(100,982)	536
Fair value of liabilities (sold) assumed	$ (191,553)	$ 56,864