Short-Term Borrowings (Schedule Of Short-Term Borrowings And Weighted-Average Interest Rates) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011
Short-term Debt [Line Items]
Outstanding as March 31, 2012	$ 346,000	$ 424,849	$ 305,205
Average amount outstanding	361,432
Weighted average interest rate during period	0.14%
Weighted average interest rate at end of period	0.26%
Federal Funds Purchased [Member]
Short-term Debt [Line Items]
Outstanding as March 31, 2012	919
Average amount outstanding	52,568
Maximum amount outstanding at any month-end	231,202
Weighted average interest rate during period	0.14%
Weighted average interest rate at end of period	0.15%
Repurchase Agreements [Member]
Short-term Debt [Line Items]
Outstanding as March 31, 2012	345,081
Average amount outstanding	308,846
Maximum amount outstanding at any month-end	345,081
Weighted average interest rate during period	0.14%
Weighted average interest rate at end of period	0.26%
Other Short-Term Borrowings [Member]
Short-term Debt [Line Items]
Outstanding as March 31, 2012	0
Average amount outstanding	18
Maximum amount outstanding at any month-end	0
Weighted average interest rate during period	7.55%
Weighted average interest rate at end of period	0.00%
Integra Bank [Member]
Short-term Debt [Line Items]
Outstanding as March 31, 2012		$ 114
Weighted average interest rate at end of period	7.26%
Maturity date	Jan. 01, 2012