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Fair Value of Financial Instruments (Details 3) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Collateral dependent impaired loans $ 89 $ 1,481
Collateral dependent impaired loans Valuation Technique Market comparable properties Market comparable properties
Collateral dependent impaired loans Unobservable Inputs Marketability discount Marketability discount
Collateral dependent impaired loans Range 35.00% 12.00%
Fair Value, Inputs, Level 3 [Member]
   
Other Securities Fair Value $ 1,168 $ 840
Other Securities Valuation Technique Discounted cash flow Discounted cash flow
Other Securities Unobservable Inputs Discount margin Cumulative default % Loss given default % Cumulative prepayment % Discount margin Cumulative default % Loss given default % Cumulative prepayment %
Minimum [Member] | Fair Value, Inputs, Level 3 [Member]
   
Other Securities Range - Discount Margin 6.50% 7.00%
Other Securities Range - Cumulative Default 2.70% 2.20%
Other Securities Range - Loss Given Default 85.00% 85.00%
Other Securities Range - Cumulative Prepayment 0.00% 0.00%
Maximum [Member] | Fair Value, Inputs, Level 3 [Member]
   
Other Securities Range - Discount Margin 14.00% 14.25%
Other Securities Range - Cumulative Default 100.00% 100.00%
Other Securities Range - Loss Given Default 100.00% 100.00%
Other Securities Range - Cumulative Prepayment 100.00% 100.00%