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Loans Receivable and Allowance for Loan Losses (Impaired Loans Acquired in North Penn Acquisition) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Accretable discount $ 76 $ 171 $ 329
North Penn Bancorp, Inc. [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal balance   1,936  
Interest   1,669  
Contractual cash flows   3,605  
Non-accretable discount   (1,724)  
Expected cash flows   1,881  
Accretable discount   (329)  
Estimated fair value   $ 1,552