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Fair value of financial instruments
 12 Months Ended
Dec. 31, 2011
Fair value of financial instruments [Abstract]  
Fair value of financial instruments
11.  Fair value of financial instruments:

Assets and liabilities measured at fair value on a recurring basis at December 31, 2011 and 2010, are summarized as follows:
 
   
Fair Value Measurement Using
December 31, 2011
 
Amount
  
Quoted Prices in Active Markets for Identical Assets
(Level 1)
  
Significant Other Observable Inputs
(Level 2)
 
Significant Unobservable Inputs
(Level 3)
U.S. Government-sponsored enterprises
 $32,776     $32,776  
State and Municipals:
            
Taxable
  19,728      19,728  
Tax-exempt
  39,686      39,686  
Corporate debt securities
  3,850      3,850  
Mortgage-backed securities:
            
U.S. Government agencies
  16,912      16,912  
U.S. Government-sponsored enterprises
  26,263      26,263  
Equity securities:
            
Preferred
  117      117  
Common
  567  $567      
Total
 $139,899  $567  $139,332  
               
   
 
Fair Value Measurement Using
December 31, 2010
 
Amount
  
Quoted Prices in Active Markets for Identical Assets
(Level 1)
  
Significant Other Observable Inputs
(Level 2)
 
Significant Unobservable Inputs
(Level 3)
U.S. Government-sponsored enterprises
 $38,785      $38,785  
State and Municipals:
             
Taxable
  18,374       18,374  
Tax-exempt
  50,309       50,309  
Corporate debt securities
  4,020       4,020  
Mortgage-backed securities:
             
U.S. Government agencies
  4,476       4,476  
U.S. Government-sponsored enterprises
  4,527       4,527  
Equity securities:
             
Preferred
  54       54  
Common
  1,227  $1,227      
Total
 $121,772  $1,227  $120,545  

Assets and liabilities measured at fair value on a non-recurring basis at December 31, 2011 and 2010, are summarized as follows:

   
Fair Value Measurement Using
 
December 31, 2011
 
Amount
 
Quoted Prices in Active Markets for Identical Assets (Level 1)
 
Significant
Other Observable Inputs
(Level 2)
 
Significant Unobservable
Inputs
(Level 3)
 
Impaired loans
 $7,341       $7,341 
               
   
Fair Value Measurement Using
 
December 31, 2010
 
Amount
 
Quoted Prices in Active Markets for Identical Assets (Level 1)
 
Significant
Other Observable
 Inputs
(Level 2)
 
Significant Unobservable
Inputs
(Level 3)
 
Impaired loans
 $7,769       $7,769 

Fair values of impaired loans are based on the present value of expected future cash flows discounted at the loan's effective interest rate or the fair value of the collateral if the loan is collateral dependent.

The estimated fair value of financial instruments at December 31, 2011 and December 31, 2010, is as follows:
 
   
2011
  
2010
 
December 31
 
Carrying Value
  
Fair
 Value
  
Carrying Value
  
Fair
Value
 
Financial assets:
            
Cash and cash equivalents
 $10,559  $10,559  $17,841  $17,841 
Investment securities available-for-sale
  139,899   139,899   121,772   121,772 
Loans held for sale
  569   569   30   30 
Net loans
  439,754   447,717   386,672   393,033 
Accrued interest receivable
  3,448   3,448   3,003   3,003 
Restricted equity securities
  2,374   2,374   2,642   2,642 
Total
 $596,603  $604,566  $531,960  $538,321 
Financial liabilities:
                
Deposits
 $494,283  $497,680  $438,734  $440,529 
Short-term borrowings
  43,791   43,791   38,724   38,724 
Long-term debt
  18,927   19,300   27,336   27,872 
Accrued interest payable
  284   284   311   311 
Total
 $557,285  $561,055  $505,105  $507,436