Acquisition Activity (Schedule Of Total Estimated Purchase Price Allocated To Net Tangible And Intangible Assets Based On Their Current Estimated Fair Values) (Details) (USD $)			12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011 Integra [Member]
Cash and cash equivalents			$ 314,954,000
Investment securities - available for sale			453,700,000
Federal Home Loan Bank stock, at cost			15,226,000
Residential loans held for sale			1,690,000
Loans - covered			727,330,000
Loans - non-covered			56,828,000
Premises and equipment			19,713,000
Other real estate owned			34,055,000
Accrued interest receivable			4,751,000
Goodwill			16,864,000	[1]
Other intangible assets			4,291,000
FDIC indemnification asset			167,949,000
Other assets			9,999,000
Assets acquired	985,000,000		1,827,350,000
Deposits	6,611,563,000	5,462,925,000	1,443,209,000
Short-term borrowings	424,849,000	298,232,000	7,654,000
Other borrowings			192,895,000
FDIC settlement payable			170,759,000
Other liabilities			12,833,000
Liabilities assumed			1,827,350,000
Goodwill reduced due to financial measurement of liabilities	$ 12,800,000

[1] Within the measurement period, goodwill was reduced by $12.8 million due to final measurement of the liabilities associated with the acquisition.