Available-For-Sale And Held-To-Maturity Securities (Schedule Of Gross Unrealized Losses And The Estimated Fair Value By Length Of Time) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012
Available-for-sale Securities, Gross unrealized losses, Less than 12 months	$ (3,579)
Available-for-sale Securities, Estimated fair value, Less than 12 months	241,071
Available-for-sale Securities, Gross unrealized losses, 12 months or more	(1,233)
Available-for-sale Securities, Estimated fair value, 12 months or more	29,312
Available-for-sale Securities, Gross unrealized losses, Total	(4,812)
Available-for-sale Securities, Estimated fair value, Total	270,383
U.S. Government Agency Securities [Member]
Available-for-sale Securities, Gross unrealized losses, Less than 12 months	(1)
Available-for-sale Securities, Estimated fair value, Less than 12 months	109
Available-for-sale Securities, Gross unrealized losses, Total	(1)
Available-for-sale Securities, Estimated fair value, Total	109
State And Municipal Securities [Member]
Available-for-sale Securities, Gross unrealized losses, Less than 12 months	(599)
Available-for-sale Securities, Estimated fair value, Less than 12 months	32,562
Available-for-sale Securities, Gross unrealized losses, Total	(599)
Available-for-sale Securities, Estimated fair value, Total	32,562
Commercial [Member]
Available-for-sale Securities, Gross unrealized losses, Less than 12 months	(997)
Available-for-sale Securities, Estimated fair value, Less than 12 months	82,876
Available-for-sale Securities, Gross unrealized losses, 12 months or more	(2)
Available-for-sale Securities, Estimated fair value, 12 months or more	560
Available-for-sale Securities, Gross unrealized losses, Total	(999)
Available-for-sale Securities, Estimated fair value, Total	83,436
Corporate Fixed Income Securities [Member]
Available-for-sale Securities, Gross unrealized losses, Less than 12 months	(1,510)
Available-for-sale Securities, Estimated fair value, Less than 12 months	108,235
Available-for-sale Securities, Gross unrealized losses, 12 months or more	(1,231)
Available-for-sale Securities, Estimated fair value, 12 months or more	28,752
Available-for-sale Securities, Gross unrealized losses, Total	(2,741)
Available-for-sale Securities, Estimated fair value, Total	136,987
Asset-Backed Securities [Member]
Available-for-sale Securities, Gross unrealized losses, Less than 12 months	(472)
Available-for-sale Securities, Estimated fair value, Less than 12 months	17,289
Available-for-sale Securities, Gross unrealized losses, Total	(472)
Available-for-sale Securities, Estimated fair value, Total	$ 17,289