Short-Term Borrowings (Schedule Of Short-Term Borrowings And Weighted-Average Interest Rates) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Short-term Debt [Line Items]
Short-term borrowings	$ 424,849	$ 298,232
Average amount outstanding	363,623	328,535
Weighted average interest rate during year	0.15%	0.20%
Weighted average interest rate at end of year	0.26%	0.16%
Federal Funds Purchased [Member]
Short-term Debt [Line Items]
Short-term borrowings	103,010	1,663
Average amount outstanding	14,302	7,012
Maximum amount outstanding at any month-end	103,010	41,365
Weighted average interest rate during year	0.09%	0.18%
Weighted average interest rate at end of year	0.12%	0.00%
Repurchase Agreements [Member]
Short-term Debt [Line Items]
Short-term borrowings	321,725	287,414
Average amount outstanding	340,053	312,773
Maximum amount outstanding at any month-end	366,915	348,403
Weighted average interest rate during year	0.15%	0.17%
Weighted average interest rate at end of year	0.31%	0.16%
Other Short-Term Borrowings [Member]
Short-term Debt [Line Items]
Short-term borrowings	114	9,155
Average amount outstanding	9,268	8,750
Maximum amount outstanding at any month-end	11,336	10,423
Weighted average interest rate during year	0.17%	1.27%
Weighted average interest rate at end of year	0.04%	0.00%
Integra Bank [Member]
Short-term Debt [Line Items]
Short-term borrowings	$ 100