Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Operating Activities
Net income	$ 95,289	$ 75,109
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	21,795	48,773
Depreciation, amortization, and accretion, net	26,342	32,520
Deferred income tax expense	49,891	40,456
Decrease in interest receivable	4,263	4,476
Decrease in interest payable	(1,515)	(2,880)
(Increase) decrease in trading account assets	(14,205)	33
Originations of mortgage loans held for sale	(347,327)	(539,281)
Proceeds from sales of mortgage loans held for sale	323,940	627,950
Gains on sales of mortgage loans held for sale	(5,493)	(11,168)
(Increase) decrease in fair value of mortgage loans held for sale	(1,782)	7,930
(Increase) decrease in other assets	(13,247)	26,014
Decrease in accrued salaries and benefits	(5,210)	(15,480)
Increase (decrease) in other liabilities	7,928	(12,635)
Investment securities gains, net	(1,331)	(1,448)
Losses on sales of other loans held for sale, net	2,226	79
Losses and write-downs on other real estate, net	8,229	14,314
Decrease in fair value of private equity investments, net	369	1,140
Increase in accrual for Visa indemnification	752	801
Share-based compensation expense	4,698	3,350
Write-downs on other assets held for sale	7,508	170
Gain on sale of Memphis branches, net	(5,789)	0
Gain on sale of branch property	(3,116)	0
Other, net	0	(581)
Net cash provided by operating activities	154,215	299,642
Investing Activities
Net cash (used) received in dispositions/acquisitions	(90,571)	56,328
Net decrease in interest earning deposits with banks	16,664	1,377
Net decrease in federal funds sold and securities purchased under resale agreements	1,422	24,881
Net (increase) decrease in interest bearing funds with Federal Reserve Bank	(44,756)	39,139
Proceeds from maturities and principal collections of investment securities available for sale	245,108	392,737
Proceeds from sales of investment securities available for sale	20,815	347,386
Purchases of investment securities available for sale	(111,505)	(925,603)
Proceeds from sales of loans	36,530	82,753
Proceeds from sale of other real estate	28,147	49,535
Principal repayments by borrowers on other loans held for sale	770	334
Net increase in loans	(594,896)	(276,715)
Purchases of premises and equipment	(28,776)	(15,798)
Proceeds from disposals of premises and equipment	4,838	21
Proceeds from sale of other assets held for sale	241	918
Net cash used in investing activities	(515,969)	(222,707)
Financing Activities
Net increase (decrease) in demand and savings deposits	208,039	(416,596)
Net increase in certificates of deposit	100,011	13,428
Net (decrease) increase in federal funds purchased and securities sold under repurchase agreements	(20,292)	21,690
Principal repayments on long-term debt	(625)	(150,807)
Proceeds from issuance of long-term debt	224,958	311,732
Dividends paid to common shareholders	(19,460)	(16,981)
Dividends paid to preferred shareholders	(5,119)	(24,197)
Stock options exercised	1,304	134
Excess tax benefit from share-based compensation	201	0
Restricted stock activity	(468)	(1,481)
Net cash provided by (used in) financing activities	488,549	(263,078)
Increase (decrease) in cash and cash equivalents	126,795	(186,143)
Cash and cash equivalents at beginning of period	469,630	614,630
Cash and cash equivalents at end of period	596,425	428,487
Supplemental Cash Flow Information
Income tax payments, net	4,530	1,437
Interest paid	56,657	62,763
Non-cash Investing Activities:
Mortgage loans held for sale transferred to loans at fair value	89	14,471
Premises and equipment transferred to other assets held for sale	13,037	0
Loans foreclosed and transferred to other real estate	25,280	51,835
Loans transferred to other loans held for sale at fair value	31,605	87,189
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	1,395
Securities sold during the period but settled after period-end	0	(13,198)
Dispositions/Acquisitions:
Fair value of non-cash assets (sold) acquired	(100,982)	536
Fair value of liabilities (sold) assumed	$ (191,553)	$ 56,864