CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Cash Flows From Operating Activities
Net income	$ 60,152	$ 42,400	$ 161,827	$ 131,750
Adjustments to net income:
Provision for credit losses on loans and leases, excluding covered loans	2,000	7,500	3,000	7,500
Provision for losses on covered loans	18,089	5,147	38,848	25,979
Amortization of intangibles	1,932	2,105	5,336	6,377
Depreciation and amortization	8,324	6,930	23,765	20,582
Share-based employee compensation expense			13,694	14,171
Deferred income tax benefit			926	2,578
Gain on disposal of assets	(3,199)	(5,191)	(8,401)	(16,037)
Gain on sale of securities	(856)	(3,520)	(1,026)	(5,339)
Gain on acquisition				(8,164)
Impairment loss on securities	39	193	217	651
Other, net			(29,115)	(8,708)
Net change in:
Trading securities			(2,187)	161,591
Other assets and other liabilities, net			75,109	105,224
Net cash provided by operating activities			281,993	438,155
Cash Flows From Investing Activities
Purchase of securities available-for-sale			(2,997,503)	(3,990,753)
Sales of securities available-for-sale	1,000	48,200	6,216	101,548
Maturities and paydowns of securities available-for-sale			2,699,482	2,496,283
Purchase of securities held-to-maturity			(728,064)
Maturities and paydowns of securities held-to-maturity			20,124
Loan originations, net of principal collections			(779,081)	(508,913)
Net payments for premises and equipment			(23,039)	(32,927)
Net cash (paid) acquired in acquisitions			(123,746)	28,066
Other investing activities, net			23,976	96,819
Net cash used in investing activities			(1,901,635)	(1,809,877)
Cash Flows From Financing Activities
Net increase in deposits			2,124,734	1,605,424
Net (decrease) increase in federal funds purchased and securities sold under repurchase agreements			(50,000)	30,000
Net decrease in short-term borrowings, net of transfers from long-term debt			(94,141)	(150,895)
Net increase (decrease) in long-term debt			1,906	(757)
Proceeds from exercise of stock options			21,653	4,792
Tax benefit from exercise of stock options			2,959	1,024
Cash dividends paid			(40,029)	(31,851)
Other financing activities, net			(2,416)	(26,454)
Net cash provided by financing activities			1,964,666	1,431,283
Net increase in cash and cash equivalents			345,024	59,561
Cash and cash equivalents at beginning of year			244,814	434,689
Cash and cash equivalents at end of period	589,838	494,250	589,838	494,250
Cash paid during the period for:
Interest			47,903	70,612
Income taxes			53,783	79,739
Non-cash investing activities:
Transfer of loans to other real estate owned			58,202	81,109
Transfer of SERP liability to equity			8,348
Assets acquired (liabilities assumed) in acquisitions:
Securities available-for-sale		10,441		10,441
Loans and leases	318,301		318,301
Covered loans		55,313		55,313
Covered other real estate owned		7,463		7,463
Deposits		(126,795)		(126,795)
Other borrowings	$ (320,856)	$ (3,165)	$ (320,856)	$ (3,165)