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Comprehensive Income (Schedule of Components of Comprehensive Income) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Comprehensive Income [Abstract]      
Reclassification adjustment of OTTI losses included in income $ 870 $ 342 $ 5,576
Reclassification adjustment of OTTI losses included in income, Tax effect (265) (119) (1,121)
Other Comprehensive Income Loss Reclassification Adjustment For Writedown Of Securities Included In Net Income Net of Tax Amount 605 223 4,455
Unrealized holding gains on available-for-sale securities 19,819 8,990 3,822
Unrealized holding gains on available-for-sale securities, Tax effect (7,444) (3,486) (1,791)
Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax Amount 12,375 5,504 2,031
Unrealized gains and losses on securities available-for-sale: Unrealized holding gains arising during the period 12,375 5,504 2,031
Unrealized gains and losses on securities available-for-sale: Reclassification adjustment on OTTI losses included in income 605 223 4,455
Reclassification adjustment for realized gains arising during this period (2,882) (3,976) (4,237)
Reclassification adjustment for realized gains arising during this period, Tax effect 879 1,380 852
Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, Net of Tax (2,003) (2,596) (3,385)
Unrealized gains and losses on securities available-for-sale: Reclassification adjustment for realized gains arising during the period (2,003) (2,596) (3,385)
Unrealized gains and losses on securities available-for-sale: Amortization of unrealized holding gains on securities transferred from available-for-sale to held-to-maturity securities   291  
Amortization of unrealized holding gains on securities transferred from available-for-sale to held-to-maturity   291  
Amortization of unrealized holding gains on securities transferred from available-for-sale to held-to-maturity, Tax effect   (110)  
Unrealized gains and losses on securities available-for-sale: Unrealized holding losses / gains on securities transferred from available-for-sale to held-to-maturity securities 0 181 0
Change in minimum pension liability 790 1,649 0
Change in minimum pension liability, Tax effect 323 584  
Actuarial loss (467) (1,065)  
Total other comprehensive income (see Note 6) $ 10,509 $ 2,229 $ 3,101