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Loans and the Allowance for Credit Losses (Details 9) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Summary of other real estate owned and repossessed assets    
Other real estate owned $ 4,928 $ 5,741
Repossessed assets 219 247
Total other real estate owned and repossessed assets $ 5,147 $ 5,988