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Change in Accumulated Other Comprehensive Income (Changes To Accumulated Other Comprehensive Income By Components) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2013
Unrealized Gains And Losses On Available For Sale Securities [Member]
Mar. 31, 2012
Unrealized Gains And Losses On Available For Sale Securities [Member]
Mar. 31, 2013
Change In Fair Value Of Interest Rate Swap [Member]
Mar. 31, 2012
Change In Fair Value Of Interest Rate Swap [Member]
Mar. 31, 2013
Change In Benefit Obligations And Plan Assets For The Post Retirement Benefit Plan [Member]
Dec. 31, 2012
Change In Benefit Obligations And Plan Assets For The Post Retirement Benefit Plan [Member]
Mar. 31, 2012
Change In Benefit Obligations And Plan Assets For The Post Retirement Benefit Plan [Member]
Dec. 31, 2011
Change In Benefit Obligations And Plan Assets For The Post Retirement Benefit Plan [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]                    
Beginning balance $ 3,448 $ 2,931 $ 3,824 $ 3,263 $ (419) $ (382) $ 43 $ 43 $ 50 $ 50
Other comprehensive income before reclassifications 17 276 (31) 257 48 19        
Reclassifications from other comprehensive income (390)   (390)              
Tax effect of current period changes 126 (94) 143 (87) (17) (7)        
Total other comprehensive (loss) income (247) 182 (278) 170 31 12        
Ending balance $ 3,201 $ 3,113 $ 3,546 $ 3,433 $ (388) $ (370) $ 43 $ 43 $ 50 $ 50