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Derivative Instruments (Tables)
 12 Months Ended
Dec. 31, 2012
Derivative instruments and hedging activities disclosure abstract  
Schedule of Derivative Instruments [Table Text Block]
          Other
     Other Other  noninterest
     Assets Liabilities  income
     Estimated Estimated  Gains
(Dollars in thousands) Notional Fair Value Fair Value   (Losses)
December 31, 2012:         
Pay fixed / receive variable$ 5,367  —  1,210 $ 115
Pay variable / receive fixed  5,367  1,210  —   (115)
 Total interest rate swap agreements$ 10,734  1,210  1,210 $ —
December 31, 2011:         
Pay fixed / receive variable$ 5,717  —  1,325 $ (224)
Pay variable / receive fixed  5,717  1,325  —   224
 Total interest rate swap agreements$ 11,434  1,325  1,325 $ —