Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Operating Activities
Net income	$ 48,416	$ 29,574
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	9,511	35,696
Depreciation, amortization, and accretion, net	12,312	17,622
Deferred income tax expense	25,757	14,403
Decrease in interest receivable	1,051	2,467
Decrease in interest payable	(1,440)	(2,109)
(Increase) decrease in trading account assets	(11,695)	2,062
Originations of mortgage loans held for sale	(129,160)	(245,475)
Proceeds from sales of mortgage loans held for sale	126,688	315,093
Gain on sales of mortgage loans held for sale, net	(1,898)	(3,946)
(Decrease) increase in other assets	(11,586)	14,888
Decrease in accrued salaries and benefits	(3,745)	(12,090)
Increase (decrease) in other liabilities	24,343	(9,477)
Investment securities gains, net	(1,331)	(45)
Losses on sales of other loans held for sale, net	2,266	165
Losses and write-downs on other real estate, net	4,752	8,783
Decrease in fair value of private equity investments, net	250	257
Increase in accrual for Visa indemnification	396	37
Share-based compensation expense	2,228	1,819
Gain on sale of Memphis branches, net	(5,789)	0
Gain on sale of branch property	(3,116)	0
Other, net	(940)	4,508
Net cash provided by operating activities	87,270	174,232
Investing Activities
Net cash used in dispositions	(90,571)	0
Net decrease in interest earning deposits with banks	15,186	1,552
Net decrease (increase) in federal funds sold and securities purchased under resale agreements	4,878	(9,361)
Net (increase) decrease in interest bearing funds with Federal Reserve Bank	(240,215)	165,878
Proceeds from maturities and principal collections of investment securities available for sale	117,867	216,387
Proceeds from sales of investment securities available for sale	20,815	212,240
Purchases of investment securities available for sale	(57,709)	(509,037)
Proceeds from sales of loans	29,271	44,885
Proceeds from sale of other real estate	10,000	17,436
Principal repayments by borrowers on other loans held for sale	533	62
Net (increase) decrease in loans	(243,267)	41,739
Purchases of premises and equipment, net of disposals	(12,793)	(6,374)
Proceeds from disposals of premises and equipment	4,838	4
Proceeds from sale of other assets held for sale	241	543
Net cash (used in) provided by investing activities	(440,926)	175,954
Financing Activities
Net increase (decrease) in demand and savings deposits	251,914	(631,934)
Net increase in certificates of deposit	13,561	136,083
Net increase in federal funds purchased and securities sold under repurchase agreements	16,814	36,980
Principal repayments on long-term debt	(594)	(72,309)
Proceeds from issuance of long-term debt	74,979	0
Dividends paid to common shareholders	(9,728)	(7,876)
Dividends paid to preferred shareholders	(2,559)	(12,098)
Stock options exercised	539	51
Excess tax benefit from share-based compensation	186	73
Restricted stock activity	(468)	(1,481)
Net cash provided by (used in) financing activities	344,644	(552,511)
(Decrease) increase in cash and cash equivalents	(9,012)	(202,325)
Cash and cash equivalents at beginning of period	469,630	614,630
Cash and cash equivalents at end of period	460,618	412,305
Supplemental Cash Flow Information
Income tax (refunds) payments, net	(12)	37
Interest paid	29,503	32,651
Non-cash Investing Activities:
Loans foreclosed and transferred to other real estate	12,881	29,789
Loans transferred to other loans held for sale, at fair value	24,505	46,181
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 purchased during the period but settled after period-end	10,227	0
Dispositions/Acquisitions:
Fair value of non-cash assets (sold) acquired	(100,982)	0
Fair value of liabilities (sold) assumed	$ (191,553)	$ 0