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Fair Value Measurements (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Fair value measurements    
Fair value carrying amount $ 7,157 $ 10,879
Mortgages held for sale
   
Fair value measurements    
Fair value carrying amount 7,157 10,879
Aggregate unpaid principal 7,106 10,293
Excess of fair value carrying amount over (under) unpaid principal $ 51 $ 586