Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Operating Activities
Net income	$ 119,558	$ 102,909	$ 82,170
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	74,388	88,215	98,433
Depreciation and amortization	22,872	22,088	19,495
Benefit attributable to FDIC loss share	42,552	22,752	0
Accretion of acquired loans	(117,140)	(97,471)	0
Accretion income for lease financing	(2,556)	(2,583)	(3,432)
Amortization and accretion of investment securities, net
Available for sale	15,127	11,573	5,144
Held to Maturity	38	0	0
Post medical retirement curtailment	0	0	(9,543)
Gain on acquisition	0	(1,041)	0
Gains on sales and calls of available-for-sale investment securities, net	(11,081)	(855)	(6,037)
Originations of loans held for sale	(526,719)	(583,121)	(511,416)
Proceeds from sales of loans, primarily mortgage loans sold in the secondary markets	544,690	566,668	509,683
Gains on sales of loans, net	(6,708)	(8,059)	(3,954)
Amortization of Intangible Assets	2,172	2,914	347
Net change in assets and liabilities
Interest receivable	(696)	(1,729)	3,207
Interest payable	(2,645)	(4,776)	(17,682)
Prepaid assets	365	27,509	(44,560)
Bank owned life insurance	(10,332)	(10,615)	(10,655)
Employee pension liability	32,101	(11,037)	6,695
Other assets and liabilities	(26,651)	23,535	(27,960)
NET CASH PROVIDED BY OPERATING ACTIVITIES	149,335	146,876	89,935
Proceeds from sales of securities
Available for sale	968,478	552,078	286,946
Other	20,253	0	0
Proceeds from prepayments, calls, and maturities
Available for sale	1,018,372	931,619	630,168
Held to maturity	37,326	35,654	28,552
Other	12	91	51
Purchases of securities
Available for sale	(2,267,953)	(1,381,601)	(784,067)
Held to maturity	(60,115)	(44,931)	(48,972)
Other	(278)	(199)	(464)
Purchases of ABL loans	0	0	(92,885)
Net decrease (increase) in loans and leases	(51,457)	341,195	485,898
Purchases of premises and equipment	(17,955)	(52,571)	(11,609)
Sales of premises and equipment	0	7	93
Net cash acquired from acquisitions	0	969,767	0
NET CASH PROVIDED (USED) BY INVESTING ACTIVITIES	(353,317)	1,351,109	493,711
Financing Activities
Net increase in demand accounts	434,167	373,745	443,220
Net increase in savings and money market accounts	783,625	569,533	895,778
Net decrease in certificates and other time deposits	(1,054,189)	(1,055,856)	(1,420,881)
Net (decrease) increase in securities sold under agreements to repurchase	88,680	(941,805)	74,955
Net decrease in wholesale borrowings	(122,545)	(414,098)	(604,090)
Net proceeds from issuance of preferred stock	0	0	125,000
Repurchase of preferred stock	0	0	(125,000)
Repurchase of common stock warrant	0	0	(5,025)
Net proceeds from issuance of common stock	0	400,018	79,526
Cash dividends - preferred	0	0	(1,789)
Cash dividends - common	(69,255)	(65,634)	(63,891)
Restricted stock activity	(2,295)	(2,634)	(1,758)
Proceeds from exercise of stock options, conversion of debentures or conversion of preferred stock	0	826	2,936
NET CASH (USED) PROVIDED BY FINANCING ACTIVITIES	58,188	(1,135,905)	(601,019)
Increase (decrease) in cash and cash equivalents	(145,794)	362,080	(17,373)
Cash and cash equivalents at beginning of period	523,113	161,033	178,406
Cash and cash equivalents at end of period	377,319	523,113	161,033
Cash paid during period for:
Interest, net of amounts capitalized	56,854	55,492	62,727
Federal income taxes	$ 29,115	$ 21,508	$ 21,699