Short-Term Borrowings (Summary Of Short-Term Borrowings) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Short-term Debt [Line Items]
Year-end balance	$ 266,742	$ 320,478	$ 608,098
Federal Funds Purchased [Member]
Short-term Debt [Line Items]
Average amount outstanding	150,217	280,859	312,730
Weighted average rate	0.15%	0.19%	0.20%
Highest month-end balance	206,450	560,674	361,217
Year-end balance	129,131	175,468	214,224
Weighted average rate on outstandings at year-end	0.14%	0.13%	0.20%
Security Repurchase Agreements [Member]
Short-term Debt [Line Items]
Average amount outstanding	124,929	190,365	340,015
Weighted average rate	0.05%	0.04%	0.05%
Highest month-end balance	137,611	264,187	393,874
Year-end balance	$ 137,611	$ 145,010	$ 393,874
Weighted average rate on outstandings at year-end	0.05%	0.04%	0.06%