CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Cash Flows From Operating Activities
Net income	$ 55,167	$ 48,566	$ 101,675	$ 89,350
Adjustments to net income:
Provision for credit losses on loans and leases, excluding covered loans	1,000		1,000
Provision for losses on covered loans	13,293	1,716	20,759	20,832
Amortization of intangibles	1,518	2,104	3,404	4,272
Depreciation and amortization	8,013	6,904	15,441	13,652
Share-based employee compensation expense			8,968	9,468
Deferred income tax benefit			1,276	2,686
Gain on disposal of assets	(3,011)	(8,422)	(5,202)	(10,846)
Gain on sale of securities	279	(1,689)	(170)	(1,819)
Gain on acquisition		(8,164)		(8,164)
Impairment loss on securities	178	294	178	458
Other, net			(19,467)	(9,418)
Net change in:
Trading securities			(851)	129,818
Other assets and other liabilities, net			40,111	51,709
Net cash provided by operating activities			167,122	291,998
Cash Flows From Investing Activities
Purchase of securities available-for-sale			(1,331,692)	(2,017,983)
Sales of securities available-for-sale	5,200	47,200	5,189	53,304
Maturities and paydowns of securities available-for-sale			2,031,596	1,367,512
Purchase of securities held-to-maturity			(638,006)
Maturities and paydowns of securities held-to-maturity			4,617
Loan originations, net of principal collections			(671,623)	(108,530)
Net payments for premises and equipment			(14,703)	(19,637)
Net cash (paid) acquired in acquisitions			(69,987)	28,066
Other investing activities, net			28,527	59,628
Net cash used in investing activities			(656,082)	(637,640)
Cash Flows From Financing Activities
Net increase in deposits			721,470	961,463
Net increase in federal funds purchased and securities sold under repurchase agreements			60,000
Net decrease in short-term borrowings, net of transfers from long-term debt			(95,691)	(3,105)
Net increase (decrease) in long-term debt			7,707	(757)
Proceeds from exercise of stock options			9,044	4,507
Tax benefit from exercise of stock options			1,180	992
Cash dividends paid			(26,632)	(21,211)
Other financing activities, net			(1,930)	(1,429)
Net cash provided by financing activities			675,148	940,460
Net increase in cash and cash equivalents			186,188	594,818
Cash and cash equivalents at beginning of year			244,814	434,689
Cash and cash equivalents at end of period	431,002	1,029,507	431,002	1,029,507
Cash paid during the period for:
Interest			25,674	40,129
Income taxes			30,373	26,072
Non-cash investing activities:
Transfer of loans to other real estate owned			41,728	64,191
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)