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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
Dec. 31, 2012
Available-for-sale Securities, Gross unrealized losses, Less than 12 months $ (2,043)
Available-for-sale Securities, Estimated fair value, Less than 12 months 241,156
Available-for-sale Securities, Gross unrealized losses, 12 months or more (1,351)
Available-for-sale Securities, Estimated fair value, 12 months or more 77,510
Available-for-sale Securities, Gross unrealized losses, Total (3,394)
Available-for-sale Securities, Estimated fair value, Total 318,666
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 108
Available-for-sale Securities, Gross unrealized losses, Total (2)
Available-for-sale Securities, Estimated fair value, Total 108
State And Municipal Securities [Member]
 
Available-for-sale Securities, Gross unrealized losses, Less than 12 months (852)
Available-for-sale Securities, Estimated fair value, Less than 12 months 67,189
Available-for-sale Securities, Gross unrealized losses, 12 months or more (261)
Available-for-sale Securities, Estimated fair value, 12 months or more 7,538
Available-for-sale Securities, Gross unrealized losses, Total (1,113)
Available-for-sale Securities, Estimated fair value, Total 74,727
Agency [Member]
 
Available-for-sale Securities, Gross unrealized losses, Less than 12 months (153)
Available-for-sale Securities, Estimated fair value, Less than 12 months 106,112
Available-for-sale Securities, Gross unrealized losses, Total (153)
Available-for-sale Securities, Estimated fair value, Total 106,112
Commercial [Member]
 
Available-for-sale Securities, Gross unrealized losses, Less than 12 months (96)
Available-for-sale Securities, Estimated fair value, Less than 12 months 18,324
Available-for-sale Securities, Gross unrealized losses, 12 months or more (87)
Available-for-sale Securities, Estimated fair value, 12 months or more 21,391
Available-for-sale Securities, Gross unrealized losses, Total (183)
Available-for-sale Securities, Estimated fair value, Total 39,715
Corporate Fixed Income Securities [Member]
 
Available-for-sale Securities, Gross unrealized losses, Less than 12 months (940)
Available-for-sale Securities, Estimated fair value, Less than 12 months 49,423
Available-for-sale Securities, Gross unrealized losses, 12 months or more (806)
Available-for-sale Securities, Estimated fair value, 12 months or more 34,164
Available-for-sale Securities, Gross unrealized losses, Total (1,746)
Available-for-sale Securities, Estimated fair value, Total 83,587
Asset-Backed Securities [Member]
 
Available-for-sale Securities, Gross unrealized losses, 12 months or more (197)
Available-for-sale Securities, Estimated fair value, 12 months or more 14,417
Available-for-sale Securities, Gross unrealized losses, Total (197)
Available-for-sale Securities, Estimated fair value, Total $ 14,417