Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Operating Activities
Net income	$ 57,324	$ 46,883
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	39,968	46,126
Depreciation and amortization	11,324	10,375
Benefit attributable to FDIC loss share	22,854
Accretion of acquired loans	(63,508)	(27,781)
Accretion income for lease financing	(1,304)	(1,298)
Amortization and accretion of securities, net
Available for sale	7,530	5,081
Other	13
Gain on acquisition	0	(1,041)
Gain on sales and calls of investment securities, net Available for sale	(889)	(651)
Originations of loans held for sale	(193,212)	(182,735)
Proceeds from sales of loans, primarily mortgage loans sold in the secondary mortgage markets	214,996	178,105
Gains on sales of loans, net	(3,395)	(3,275)
Amortization of intangible assets	1,086	903
Net change in assets and liabilities
Interest receivable	(1,273)	(3,825)
Interest payable	(709)	(4,414)
Prepaid assets	(16,552)	2,455
Bank owned life insurance	(4,195)	(4,204)
Employee pension liability	4,303	18,704
Other assets and liabilities	(10,560)	(8,767)
NET CASH PROVIDED BY OPERATING ACTIVITIES	63,801	70,641
Proceeds From Sales of Securities [Abstract]
Proceeds from sales of securities available for sale	3,648	500,066
Proceeds From Prepayments Calls and Maturities [Abstract]
Available for sale	503,105	369,285
Held to maturity	15,568	9,215
Other	12	25
Proceeds From Prepayments Calls and Maturities
Available for sale	(939,552)	(829,717)
Held to maturity	(36,461)	(23,688)
Other	(79)	(3,323)
Net decrease in loans and leases	28,850	132,645
Purchases of premises and equipment	(5,132)	(12,548)
Net cash acquired from acquisitions		985,506
NET CASH (USED) PROVIDED BY INVESTING ACTIVITIES	(430,041)	1,127,466
Financing Activities
Net increase in demand accounts	127,443	55,676
Net increase in savings and money market accounts	493,800	111,328
Net decrease in certificates and other time deposits	(548,310)	(32,417)
Net increase (decrease) in securities sold under agreements to repurchase	31,985	(975,335)
Net decrease in wholesale borrowings	(874)	(265,142)
Net proceeds from issuance of common stock		400,064
Cash dividends - common	(34,616)	(31,090)
Restricted stock activity	(2,223)	(2,535)
Proceeds from exercise of stock options, conversion of debentures or conversion of preferred stock		826
NET CASH PROVIDED (USED) BY FINANCING ACTIVITIES	67,205	(738,625)
Increase in cash and cash equivalents	(299,035)	459,482
Cash and cash equivalents at beginning of period	523,113	161,033
Cash and cash equivalents at end of period	224,078	620,515
Cash paid during period for:
Interest, net of amounts capitalized	27,741	33,777
Federal income taxes	$ 2,615	$ 14,108