CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Cash Flows From Operating Activities
Net income	$ 176,055	$ 135,097	$ 52,049
Adjustments to net income:
Provision for credit losses on loans and leases, excluding covered loans	12,500	103,000	285,000
Provision for losses on covered loans	43,646	76,218
Amortization of intangibles	7,727	9,036	7,357
Depreciation and amortization	27,596	25,845	26,219
Share-based employee compensation expense	19,454	16,734	14,409
Deferred income tax (benefit) expense	(34,938)	30,099	(4,283)
Gain on disposal of assets	(20,300)	(2,837)	(1,276)
Gain on sale of securities	(5,066)	(393)	(14,286)
Gain on acquisition	(8,164)	(27,339)	(38,206)
Impairment loss on securities	651	2,031	16,445
Other, net	(11,459)	(40,379)	14,650
Net change in:
Trading securities	193,026	(101,095)	147,696
Other assets and other liabilities, net	207,293	353,992	(229,903)
Net cash provided by operating activities	608,021	580,009	275,871
Cash Flows From Investing Activities
Purchase of securities available-for-sale	(5,288,118)	(4,351,981)	(3,628,275)
Sales of securities available-for-sale	101,089	574,532	829,820
Maturities and paydowns of securities available-for-sale	3,379,320	2,420,577	1,008,438
Purchase of securities held-to-maturity	(467,817)
Maturities and paydowns of securities held-to-maturity	91
Loan originations, net of principal collections	(547,887)	831,857	35,504
Net payments for premises and equipment	(42,711)	(29,906)	(16,174)
Net cash acquired in acquisitions	28,066	88,795	453,719
Other investing activities, net	122,649	82,196	(2,085)
Net cash used in investing activities	(2,715,318)	(383,930)	(1,319,053)
Cash Flows From Financing Activities
Net increase in deposits	2,083,925	255,915	2,614,128
Net increase (decrease) in federal funds purchased and securities sold under repurchase agreements	50,000	(626,779)	(281,378)
Net decrease in short-term borrowings, net of transfers from long-term debt	(151,535)	(30,609)	(1,179,849)
Net (decrease) increase in long-term debt	(757)	47,397	410,127
Proceeds from exercise of stock options	5,089	23,764	2,236
Tax benefit from exercise of stock options	2,007	3,958	237
Redemption of preferred stock		(200,000)	(200,000)
Issuance of common stock			119,929
Repurchase of common stock warrants		(18,500)
Cash dividends paid	(42,489)	(24,012)	(48,338)
Other financing activities, net	(28,818)	(5,450)	(5,249)
Net cash provided by (used in) financing activities	1,917,422	(574,316)	1,431,843
Net (decrease) increase in cash and cash equivalents	(189,875)	(378,237)	388,661
Cash and cash equivalents at beginning of year	434,689	812,926	424,265
Cash and cash equivalents at end of period	244,814	434,689	812,926
Cash paid during the period for:
Interest	73,460	96,213	83,820
Income taxes	114,990	7,195	17,838
Non-cash investing activities:
Transfer of loans to other real estate owned	113,563	168,958	69,683
Transfer from securities available-for-sale to trading securities			6,400
Assets acquired (liabilities assumed) in acquisitions:
Securities available-for-sale	10,441	17,183	314,432
Covered loans	55,313	330,566	1,862,515
Loans	1,060		8,420
Covered other real estate owned	7,463	15,161	58,761
Deposits	(126,795)	(541,499)	(2,113,195)
Other borrowings	$ (3,165)	$ (30,539)	$ (1,056,039)