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Short-term Borrowings (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Federal Funds Purchased [Member]
      
Short-term Debt [Line Items]      
Short-term Debt $ 0 $ 0 $ 0
Short-term Debt, Weighted Average Interest Rate 0.00% 0.00% 0.00%
Short-term Debt, Average Outstanding Amount 225 6 1,125
Short-term Debt, Weighted Average Interest Rate During Year 0.96% 1.00% 0.94%
Short-term Debt, Maximum Month-end Outstanding Amount 1,925 0 0
Securities Sold under Agreements to Repurchase [Member]
      
Short-term Debt [Line Items]      
Short-term Debt 2,689 2,805 2,685
Short-term Debt, Weighted Average Interest Rate 0.50% 0.50% 0.50%
Short-term Debt, Average Outstanding Amount 2,746 2,416 2,404
Short-term Debt, Weighted Average Interest Rate During Year 0.50% 0.50% 0.50%
Short-term Debt, Maximum Month-end Outstanding Amount $ 3,174 $ 2,936 $ 2,858