Investment Securities (Schedule Of Securities Based on Contractual Maturity - Available-for-Sale) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Investment Securities [Abstract]
Fair Value - Due in one year or less	$ 14,298
Fair Value - Due after one year through five years	263,064
Fair Value - Due after five years through ten years	89,726
Fair Value- Due after ten years	53,976
Fair Value - Equity securities	4,151
Fair value	425,215	348,091
Amortized Cost- Due in one year or less	14,019
Amortized Cost - Due after one year through five years	257,134
Amortized Cost- Due after five years through ten years	88,409
Amortized cost- Due after ten years	53,450
Amortized Cost- Equity securities	3,726
Amortized cost	$ 416,738	$ 341,023