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Other Comprehensive Income (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Pre-Tax Amount [Member]
      
Schedule Of Other Comprehesive Income [Line Items]      
Unrealized Net Holding Loss On Other-than-Temporarily Impaired Securities Due To Factors Other Than Credit   $ (130) $ (210)
Unrealized Net Holding Gain (Loss) On All Other Securitiies 2,188 11,187 (2,032)
Reclassification Adjustment For Net Gain On Securities Recognized In Net Earnings (679) (878) (1,423)
Other Comprehensive Income (Loss) 1,509 10,179 (3,665)
Tax Benefit (Expense) [Member]
      
Schedule Of Other Comprehesive Income [Line Items]      
Unrealized Net Holding Loss On Other-than-Temporarily Impaired Securities Due To Factors Other Than Credit   48 77
Unrealized Net Holding Gain (Loss) On All Other Securitiies (809) (4,128) 751
Reclassification Adjustment For Net Gain On Securities Recognized In Net Earnings 252 324 525
Other Comprehensive Income (Loss) (557) (3,756) 1,353
Net Of Tax Amount [Member]
      
Schedule Of Other Comprehesive Income [Line Items]      
Unrealized Net Holding Loss On Other-than-Temporarily Impaired Securities Due To Factors Other Than Credit   (82) (133)
Unrealized Net Holding Gain (Loss) On All Other Securitiies 1,379 7,059 (1,281)
Reclassification Adjustment For Net Gain On Securities Recognized In Net Earnings (427) (554) (898)
Other Comprehensive Income (Loss) $ 952 $ 6,423 $ (2,312)