Available-For-Sale And Held-To-Maturity Securities (Schedule Of Gross Unrealized Losses And The Estimated Fair Value By Length Of Time In A Loss Position) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2014	Dec. 31, 2013
Available-for-sale Securities, Gross unrealized losses, Less than 12 months	$ (1,970)	$ (14,593)
Available-for-sale Securities, Estimated fair value, Less than 12 months	255,087	686,828
Available-for-sale Securities, Gross unrealized losses, 12 months or more	(9,415)	(5,692)
Available-for-sale Securities, Estimated fair value, 12 months or more	415,261	113,876
Available-for-sale Securities, Gross unrealized losses, Total	(11,385)	(20,285)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total	670,348	800,704
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss	(760)	(91)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	34,561	8,127
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss	(3,425)	(13,389)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	120,043	1,038,047
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Loss, Total	(4,185)	(13,480)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value, Total	154,604	1,046,174
U.S. Government Agency Securities [Member]
Available-for-sale Securities, Gross unrealized losses, Less than 12 months	(4)	(2)
Available-for-sale Securities, Estimated fair value, Less than 12 months	869	721
Available-for-sale Securities, Gross unrealized losses, Total	(4)	(2)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total	869	721
State And Municipal Securities [Member]
Available-for-sale Securities, Gross unrealized losses, Less than 12 months	(5)	(2,966)
Available-for-sale Securities, Estimated fair value, Less than 12 months	423	32,272
Available-for-sale Securities, Gross unrealized losses, 12 months or more	(3,711)	(3,571)
Available-for-sale Securities, Estimated fair value, 12 months or more	66,496	41,182
Available-for-sale Securities, Gross unrealized losses, Total	(3,716)	(6,537)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total	66,919	73,454
Corporate Fixed Income Securities [Member]
Available-for-sale Securities, Gross unrealized losses, Less than 12 months	(12)	(2,062)
Available-for-sale Securities, Estimated fair value, Less than 12 months	4,978	80,700
Available-for-sale Securities, Gross unrealized losses, 12 months or more	(960)	(776)
Available-for-sale Securities, Estimated fair value, 12 months or more	69,675	39,421
Available-for-sale Securities, Gross unrealized losses, Total	(972)	(2,838)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total	74,653	120,121
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss	(1,605)	(2,605)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	48,681	47,727
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Loss, Total	(1,605)	(2,605)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value, Total	48,681	47,727
Asset-Backed Securities [Member]
Available-for-sale Securities, Gross unrealized losses, Less than 12 months	(1,635)	(4,516)
Available-for-sale Securities, Estimated fair value, Less than 12 months	193,999	436,770
Available-for-sale Securities, Gross unrealized losses, 12 months or more	(3,433)	(1,200)
Available-for-sale Securities, Estimated fair value, 12 months or more	189,170	31,938
Available-for-sale Securities, Gross unrealized losses, Total	(5,068)	(5,716)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total	383,169	468,708
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss	(612)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	8,116
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss	(1,820)	(2,774)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	71,362	92,806
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Loss, Total	(2,432)	(2,774)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value, Total	79,478	92,806
Mortgage-backed securities [Member] | Agency [Member]
Available-for-sale Securities, Gross unrealized losses, Less than 12 months	(192)	(3,260)
Available-for-sale Securities, Estimated fair value, Less than 12 months	47,174	89,395
Available-for-sale Securities, Gross unrealized losses, 12 months or more	(1,150)	(145)
Available-for-sale Securities, Estimated fair value, 12 months or more	48,836	1,335
Available-for-sale Securities, Gross unrealized losses, Total	(1,342)	(3,405)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total	96,010	90,730
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss	(135)	(91)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	25,921	8,127
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss		(7,824)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		838,295
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Loss, Total	(135)	(7,915)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value, Total	25,921	846,422
Mortgage-backed securities [Member] | Commercial [Member]
Available-for-sale Securities, Gross unrealized losses, Less than 12 months	(122)	(1,787)
Available-for-sale Securities, Estimated fair value, Less than 12 months	7,644	46,970
Available-for-sale Securities, Gross unrealized losses, 12 months or more	(161)
Available-for-sale Securities, Estimated fair value, 12 months or more	41,084
Available-for-sale Securities, Gross unrealized losses, Total	(283)	(1,787)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total	48,728	46,970
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss	(13)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	524
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss		(186)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		59,219
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Loss, Total	(13)	(186)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value, Total	524	59,219
Mortgage-backed securities [Member] | Non-Agency [Member]
Available-for-sale Securities, Gross unrealized losses, Less than 12 months
Available-for-sale Securities, Estimated fair value, Less than 12 months
Available-for-sale Securities, Gross unrealized losses, 12 months or more
Available-for-sale Securities, Estimated fair value, 12 months or more
Available-for-sale Securities, Gross unrealized losses, Total
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total