CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Cash Flows From Operating Activities
Net income	$ 209,133	$ 176,055	$ 135,097
Adjustments to net income:
Provision for credit losses on loans and leases, excluding covered loans	10,000	12,500	103,000
Provision for losses on covered loans	45,346	43,646	76,218
Amortization of intangibles	7,268	7,727	9,036
Depreciation and amortization	32,485	27,596	25,845
Share-based employee compensation expense	18,563	19,454	16,734
Deferred income tax expense (benefit)	12,309	(34,938)	30,099
Gain on disposal of assets	(11,293)	(20,300)	(2,837)
Gain on sale of securities	(1,113)	(5,066)	(393)
Gain on acquisition		(8,164)	(27,339)
Impairment loss on securities	291	651	2,031
Other, net	(28,632)	(11,459)	(40,379)
Net change in:
Trading securities	(52,134)	193,026	(101,095)
Other assets and other liabilities, net	20,130	207,293	353,992
Net cash provided by operating activities	262,353	608,021	580,009
Cash Flows From Investing Activities
Purchase of securities available-for-sale	(5,362,435)	(5,288,118)	(4,351,981)
Sales of securities available-for-sale	52,085	101,089	574,532
Maturities and paydowns of securities available-for-sale	3,659,370	3,379,320	2,420,577
Purchase of securities held-to-maturity	(958,871)	(467,817)
Maturities and paydowns of securities held-to-maturity	25,863	91
Loan originations, net of principal collections	(1,746,581)	(547,887)	831,857
Net payments for premises and equipment	(33,571)	(42,711)	(29,906)
Net cash (paid) acquired in acquisitions	(123,746)	28,066	88,795
Other investing activities, net	97,765	122,649	82,196
Net cash used in investing activities	(4,390,121)	(2,715,318)	(383,930)
Cash Flows From Financing Activities
Net increase in deposits	3,114,773	2,083,925	255,915
Net increase (decrease) in federal funds purchased and securities sold under repurchase agreements	1,164,200	50,000	(626,779)
Net decrease in short-term borrowings, net of transfers from long-term debt	(5,992)	(151,535)	(30,609)
Net (decrease) increase in long-term debt	(86,409)	(757)	47,397
Proceeds from exercise of stock options	22,428	5,089	23,764
Tax benefit from exercise of stock options	3,089	2,007	3,958
Issuance (redemption) of preferred stock	169,920		(200,000)
Repurchase of common stock warrants			(18,500)
Cash dividends paid	(80,380)	(42,489)	(24,012)
Other financing activities, net	(3,270)	(28,818)	(5,450)
Net cash provided by (used in) financing activities	4,298,359	1,917,422	(574,316)
Net increase (decrease) in cash and cash equivalents	170,591	(189,875)	(378,237)
Cash and cash equivalents at beginning of year	244,814	434,689	812,926
Cash and cash equivalents at end of period	415,405	244,814	434,689
Cash paid during the period for:
Interest	51,966	73,460	96,213
Income taxes	108,833	114,990	7,195
Non-cash investing activities:
Transfer of loans to other real estate owned	64,554	113,563	168,958
Transfer of SERP liability to equity	8,348
Assets acquired (liabilities assumed) in acquisitions:
Securities available-for-sale		10,441	17,183
Loans and leases	318,301	1,060
Covered loans		55,313	330,566
Covered other real estate owned		7,463	15,161
Deposits		(126,795)	(541,499)
Other borrowings	$ (320,856)	$ (3,165)	$ (30,539)