Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Cash flows from operating activities:
Net income	$ 34,531	$ 36,585
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	4,457	4,022
Stock-based compensation	1,443	682
Provision for credit losses	5,697	24,162
Net amortization of premiums and accretion of discounts on securities and borrowings	4,785	2,876
Amortization of other intangible assets	1,958	1,962
Losses (gains) on securities transactions, net	157	(2,679)
Net impairment losses on securities recognized in earnings		825
Proceeds from sales of loans held for sale	119,894	133,842
Gains on sales of loans, net	(3,166)	(3,609)
Originations of loans held for sale	(107,451)	(85,883)
Gains on sales of assets, net	(32)	(57)
Change in FDIC loss-share receivable (excluding reimbursements)	90	(16,235)
Net change in:
Trading securities	(252)	(493)
Fair value of borrowings carried at fair value	1,240	(2,889)
Cash surrender value of bank owned life insurance	(1,959)	(1,706)
Accrued interest receivable	1,003	(4,277)
Other assets	119,438	25,868
Accrued expenses and other liabilities	(40,432)	(19,062)
Net cash provided by operating activities	141,401	93,934
Cash flows from investing activities:
Net loan originations	(176,974)	(189,318)
Loans purchased	(117,255)
Investment securities held to maturity:
Purchases	(52,358)	(119,230)
Maturities, calls and principal repayments	142,260	158,990
Investment securities available for sale:
Purchases	(49,012)	(366,123)
Sales	8,335	105,987
Maturities, calls and principal repayments	68,102	59,139
Death benefit proceeds from bank owned life insurance	1,689
Proceeds from sales of real estate property and equipment	3,276	1,604
Purchases of real estate property and equipment	(3,807)	(2,945)
Reimbursements from the FDIC	4,372	14,952
Cash and cash equivalents acquired in acquisition	117,587
Net cash used in investing activities	(53,785)	(336,944)
Cash flows from financing activities:
Net change in deposits	(96,211)	358,761
Net change in short-term borrowings	197,900	(13,504)
Repayments of long-term borrowings	(30,000)	(116,000)
Redemption of junior subordinated debentures	(10,000)
Dividends paid to common shareholders	(29,355)	(29,063)
Common stock issued, net	1,836	2,027
Net cash provided by financing activities	34,170	202,221
Net change in cash and cash equivalents	121,786	(40,789)
Cash and cash equivalents at beginning of year	379,049	366,286
Cash and cash equivalents at end of period	500,835	325,497
Supplemental disclosures of cash flow information:
Interest on deposits and borrowings	46,449	50,580
Federal and state income taxes	7,995
Non-cash assets acquired:
Investment securities available for sale	275,650
Loans	1,098,948
Premises and equipment, net	8,587
Accrued interest receivable	5,294
Goodwill	102,472
Other intangible assets, net	8,050
Other assets	68,080
Total non-cash assets acquired	1,567,081
Liabilities assumed:
Deposits	1,380,293
Short-term borrowings	29,000
Junior subordinated debentures issued to capital trusts	15,645
Other liabilities	51,312
Total liabilities assumed	1,476,250
Net non-cash assets acquired	90,831
Net cash and cash equivalents acquired	117,587
Common stock issued in acquisition	$ 208,418