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	12 Months Ended
	Dec. 31, 2013
Available-for-sale Securities, Gross unrealized losses, Less than 12 months	$ (14,593)
Available-for-sale Securities, Estimated fair value, Less than 12 months	686,828
Available-for-sale Securities, Gross unrealized losses, 12 months or more	(5,692)
Available-for-sale Securities, Estimated fair value, 12 months or more	113,876
Available-for-sale Securities, Gross unrealized losses, Total	(20,285)
Available-for-sale Securities, Estimated fair value, Total	800,704
U.S. Government Agency Securities [Member]
Available-for-sale Securities, Gross unrealized losses, Less than 12 months	(2)
Available-for-sale Securities, Estimated fair value, Less than 12 months	721
Available-for-sale Securities, Gross unrealized losses, Total	(2)
Available-for-sale Securities, Estimated fair value, Total	721
State And Municipal Securities [Member]
Available-for-sale Securities, Gross unrealized losses, Less than 12 months	(2,966)
Available-for-sale Securities, Estimated fair value, Less than 12 months	32,272
Available-for-sale Securities, Gross unrealized losses, 12 months or more	(3,571)
Available-for-sale Securities, Estimated fair value, 12 months or more	41,182
Available-for-sale Securities, Gross unrealized losses, Total	(6,537)
Available-for-sale Securities, Estimated fair value, Total	73,454
Agency [Member]
Available-for-sale Securities, Gross unrealized losses, Less than 12 months	(3,260)
Available-for-sale Securities, Estimated fair value, Less than 12 months	89,395
Available-for-sale Securities, Gross unrealized losses, 12 months or more	(145)
Available-for-sale Securities, Estimated fair value, 12 months or more	1,335
Available-for-sale Securities, Gross unrealized losses, Total	(3,405)
Available-for-sale Securities, Estimated fair value, Total	90,730
Commercial [Member]
Available-for-sale Securities, Gross unrealized losses, Less than 12 months	(1,787)
Available-for-sale Securities, Estimated fair value, Less than 12 months	46,970
Available-for-sale Securities, Gross unrealized losses, Total	(1,787)
Available-for-sale Securities, Estimated fair value, Total	46,970
Corporate Fixed Income Securities [Member]
Available-for-sale Securities, Gross unrealized losses, Less than 12 months	(2,062)
Available-for-sale Securities, Estimated fair value, Less than 12 months	80,700
Available-for-sale Securities, Gross unrealized losses, 12 months or more	(776)
Available-for-sale Securities, Estimated fair value, 12 months or more	39,421
Available-for-sale Securities, Gross unrealized losses, Total	(2,838)
Available-for-sale Securities, Estimated fair value, Total	120,121
Asset-Backed Securities [Member]
Available-for-sale Securities, Gross unrealized losses, Less than 12 months	(4,516)
Available-for-sale Securities, Estimated fair value, Less than 12 months	436,770
Available-for-sale Securities, Gross unrealized losses, 12 months or more	(1,200)
Available-for-sale Securities, Estimated fair value, 12 months or more	31,938
Available-for-sale Securities, Gross unrealized losses, Total	(5,716)
Available-for-sale Securities, Estimated fair value, Total	$ 468,708