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Comprehensive Income (Schedule of Components of Comprehensive Income) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Comprehensive Income [Abstract]        
Unrealized holding gains on available-for-sale securities     $ 19,391 $ 8,051
Unrealized holding gains on available-for-sale securities, Tax effect     (7,259) (3,189)
Unrealized gains and losses on securities available-for-sale: Unrealized holding gains arising during the period 6,223 225 12,132 4,862
Reclassification adjustment of OTTI losses included in income     332 303
Reclassification adjustment of OTTI losses included in income, Tax effect     (105) (106)
Unrealized gains and losses on securities available-for-sale: Reclassification adjustment on OTTI losses included in income 96 44 227 197
Reclassification adjustment for net gains arising during this period     (2,545) (3,120)
Reclassification adjustment for net gains arising during this period, Tax effect     802 1,089
Unrealized gains and losses on securities available-for-sale: Reclassification adjustment for net gains arising during the period (651) (869) (1,743) (2,031)
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     4 (24)
Amortization of unrealized holding gains on securities transferred from available-for-sale to held-to-maturity     4 (24)
Amortization of unrealized holding gains on securities transferred from available-for-sale to held-to-maturity, Tax effect     (1) 10
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 (1) (9) 3 (14)
Change in minimum pension liability       142
Change in minimum pension liability, Tax effect       57
Change in minimum pension liability       85
Total other comprehensive income (see Note 6) $ 5,667 $ (640) $ 10,619 $ 3,110