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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
Mar. 31, 2013
Available-for-sale Securities, Gross unrealized losses, Less than 12 months $ (4,903)
Available-for-sale Securities, Estimated fair value, Less than 12 months 520,397
Available-for-sale Securities, Gross unrealized losses, 12 months or more (1,000)
Available-for-sale Securities, Estimated fair value, 12 months or more 103,213
Available-for-sale Securities, Gross unrealized losses, Total (5,903)
Available-for-sale Securities, Estimated fair value, Total 623,610
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 509
Available-for-sale Securities, Gross unrealized losses, Total (1)
Available-for-sale Securities, Estimated fair value, Total 509
State And Municipal Securities [Member]
 
Available-for-sale Securities, Gross unrealized losses, Less than 12 months (1,977)
Available-for-sale Securities, Estimated fair value, Less than 12 months 78,533
Available-for-sale Securities, Gross unrealized losses, 12 months or more (661)
Available-for-sale Securities, Estimated fair value, 12 months or more 32,554
Available-for-sale Securities, Gross unrealized losses, Total (2,638)
Available-for-sale Securities, Estimated fair value, Total 111,087
Agency [Member]
 
Available-for-sale Securities, Gross unrealized losses, Less than 12 months (2,436)
Available-for-sale Securities, Estimated fair value, Less than 12 months 373,671
Available-for-sale Securities, Gross unrealized losses, Total (2,436)
Available-for-sale Securities, Estimated fair value, Total 373,671
Commercial [Member]
 
Available-for-sale Securities, Gross unrealized losses, Less than 12 months (1)
Available-for-sale Securities, Estimated fair value, Less than 12 months 12,933
Available-for-sale Securities, Gross unrealized losses, 12 months or more (28)
Available-for-sale Securities, Estimated fair value, 12 months or more 17,378
Available-for-sale Securities, Gross unrealized losses, Total (29)
Available-for-sale Securities, Estimated fair value, Total 30,311
Corporate Fixed Income Securities [Member]
 
Available-for-sale Securities, Gross unrealized losses, Less than 12 months (479)
Available-for-sale Securities, Estimated fair value, Less than 12 months 41,688
Available-for-sale Securities, Gross unrealized losses, 12 months or more (252)
Available-for-sale Securities, Estimated fair value, 12 months or more 39,705
Available-for-sale Securities, Gross unrealized losses, Total (731)
Available-for-sale Securities, Estimated fair value, Total 81,393
Asset-Backed Securities [Member]
 
Available-for-sale Securities, Gross unrealized losses, Less than 12 months (9)
Available-for-sale Securities, Estimated fair value, Less than 12 months 13,063
Available-for-sale Securities, Gross unrealized losses, 12 months or more (59)
Available-for-sale Securities, Estimated fair value, 12 months or more 13,576
Available-for-sale Securities, Gross unrealized losses, Total (68)
Available-for-sale Securities, Estimated fair value, Total $ 26,639