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Loans - Credit impaired loans aquired during the period (Details) (USD $)
Sep. 30, 2013
Dec. 31, 2012
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]    
Contractually required payments receivable at acquisition $ 6,912,000 $ 0
Cash flows expected to be collected at acquisition 2,681,000 0
Fair value of in acquired loans at acquisition 2,576,000 0
Loans acquired during the period 1,411,000 0
Loans at the end of the period 1,411,000 0
Real estate
   
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]    
Contractually required payments receivable at acquisition $ 6,912,000 $ 0