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Investment securities available-for-sale
 12 Months Ended
Dec. 31, 2011
Investment securities available-for-sale [Abstract]  
Investment securities available-for-sale
3.  Investment securities available-for-sale:

The amortized cost and fair value of investment securities available-for-sale aggregated by investment category at December 31, 2011 and December 31, 2010, are summarized as follows:  
December 31, 2011
 
Amortized Cost
  
Gross Unrealized Gains
  
Gross Unrealized Losses
  
Fair
 Value
 
U.S. Government-sponsored enterprises
 $29,671  $3,105     $32,776 
State and municipals:
               
    Taxable
  18,120   1,608      19,728 
Tax-exempt
  38,217   1,693  $224   39,686 
Corporate debt securities
  4,462   330   942   3,850 
Mortgage-backed securities:
                
U.S. Government agencies
  16,827   185   100   16,912 
U.S. Government-sponsored enterprises
  26,396   66   199   26,263 
Equity securities:
                
Preferred
  54   63       117 
Common
  629   22   84   567 
Total
 $134,376  $7,072  $1,549  $139,899 
December 31, 2010
 
Amortized Cost
  
 
Gross Unrealized Gains
  
Gross Unrealized Losses
  
Fair
 Value
 
U.S. Government-sponsored enterprises
 $37,828  $1,066  $109  $38,785 
State and municipals:
                
Taxable
  18,634   127   387   18,374 
Tax-exempt
  51,789   146   1,626   50,309 
Corporate debt securities
  4,467   208   655   4,020 
Mortgage-backed securities:
                
U.S. Government agencies
  4,389   87       4,476 
U.S. Government-sponsored enterprises
  4,598   26   97   4,527 
Equity securities:
                
Preferred
  54           54 
Common
  1,277   114   164   1,227 
Total
 $123,036  $1,774  $3,038  $121,772 

Net unrealized gains and losses on investment securities available-for-sale securities are included as a separate component of stockholders' equity.  The Company had a net unrealized gain of $3,645, net of deferred income taxes of $1,878, at December 31, 2011 and a net unrealized loss of $834, net of deferred income taxes of $430, at December 31, 2010.  Proceeds from the sale of investment securities available-for-sale amounted to $22,497 in 2011, $64,439 in 2010 and $62,172 in 2009.  Gross gains of $341, $784 and $879 were realized on the sale of securities in 2011, 2010 and 2009, respectively.  Gross losses realized on the sale of securities were $316 in 2011, $438 in 2010 and $1,371 in 2009.  The income tax provision applicable to net realized gains amounted to $9 and $118 in 2011 and 2010, respectively.  The income tax benefit attributed to the net realized loss was $167 in 2009.

The maturity distribution of the fair value, which is the net carrying amount, of the debt securities classified as available-for-sale at December 31, 2011, is summarized in the table that follows.

December 31, 2011
 
Fair Value
 
Within one year
 $732 
After one but within five years
  12,281 
After five but within ten years
  35,450 
After ten years
  47,577 
    96,040 
Mortgage-backed securities
  43,175 
Total
 $139,215 

Securities with a carrying value of $105,135 and $84,281 at December 31, 2011 and December 31, 2010, respectively, were pledged to secure public deposits and repurchase agreements as required or permitted by law.

At December 31, 2011 and 2010, there were no securities of any individual issuer, except for U.S. Government agencies and sponsored enterprises, that exceeded 10.0 percent of stockholders' equity.

The fair value and gross unrealized losses of investment securities available-for-sale with unrealized losses for which an other-than-temporary impairment has not been recognized at December 31, 2011 and December 31, 2010, aggregated by investment category and length of time that the individual securities have been in a continuous unrealized loss position, are summarized as follows:

   
Less Than 12 Months
  
12 Months or More
  
Total
 
December 31, 2011
 
Fair Value
  
Unrealized Losses
  
Fair Value
  
Unrealized Losses
  
Fair Value
  
Unrealized Losses
 
U.S. Government-sponsored enterprises
                  
State and municipals:
                  
Taxable
                  
Tax-exempt
 $1,142  $39  $2,859  $185  $4,001  $224 
Corporate debt securities
  970   61   2,130   881   3,100   942 
Mortgage-backed securities:
                        
U.S. Government agencies
  10,785   100           10,785   100 
U.S. Government-sponsored enterprises
  21,825   199           21,825   199 
Equity securities:
                        
Preferred
                        
Common
          195   84   195   84 
Total
 $34,722  $399  $5,184  $1,150  $39,906  $1,549 
 
   
Less Than 12 Months
  
12 Months or More
  
Total
 
December 31, 2010
 
Fair Value
  
Unrealized Losses
  
Fair Value
  
Unrealized Losses
  
Fair Value
  
Unrealized Losses
 
U.S. Government-sponsored enterprises
 $4,414  $109        $4,414  $109 
State and municipals:
                      
Taxable
  12,576   324  $430  $63   13,006   387 
Tax-exempt
  33,643   977   2,645   649   36,288   1,626 
Corporate debt securities
          2,358   655   2,358   655 
Mortgage-backed securities:
                        
U.S. Government agencies
                        
U.S. Government-sponsored enterprises
  3,562   97           3,562   97 
Equity securities:
                        
Preferred
                        
Common
          374   164   374   164 
Total
 $54,195  $1,507  $5,807  $1,531  $60,002  $3,038 

The Company had 31 investment securities, consisting of six tax-exempt state and municipal obligations, three corporate debt securities, 18 mortgage-backed securities and four common equity securities, that were in unrealized loss positions at December 31, 2011.  Of these securities, four state and municipal obligations, two corporate debt securities and each of the common equity securities were in continuous unrealized loss positions for 12 months or more.  The unrealized losses on the common equity securities were a direct reflection of reductions in stock values in the financial industry sector, as a whole, and was not a result of credit or other issues that would cause the Company to realize an OTTI charge.  Management does not consider the unrealized losses on the debt securities, as a result of changes in interest rates, to be OTTI based on historical evidence that indicates the cost of these securities is recoverable within a reasonable period of time in relation to normal cyclical changes in the market rates of interest. Moreover, because there has been no material change in the credit quality of the issuers or other events or circumstances that may cause a significant adverse impact on the fair value of these securities, and management does not intend to sell these securities and it is unlikely that the Company will be required to sell these securities before recovery of their amortized cost basis, which may be maturity, the Company does not consider the unrealized losses to be OTTI at December 31, 2011.

An OTTI of $87 was recognized for the year ended December 31, 2011.  The impairment was the result of writing down two common equity securities based on quoted market prices.  In reaching the determination to record the impairment, management reviewed the facts and circumstances available surrounding the securities, including the duration and amount of the unrealized loss, the financial condition of the issuers and the prospects for a change in market value within a reasonable period of time.  Based on its assessment, management determined that the impairments were other-than-temporary and that a charge to operating results was appropriate for the securities.  The charges were recognized based entirely on the assessment of the credit quality deterioration of the underlying companies.  The Company recognized $164 and $206 of OTTI on certain common equity securities in 2010 and 2009, respectively.

The Company had 106 investment securities, consisting of four U.S. Government-sponsored enterprises, 90 state and municipal obligations, four mortgage-backed securities, two corporate debt securities and six common equity securities, that were in unrealized loss positions at December 31, 2010.  Of these securities, eight state and municipal obligations and each of the corporate debt and common equity securities were in continuous unrealized loss positions for 12 months or more.

None of the corporate debt securities are private label trust preferred issuances.  This sector of the portfolio contains corporate bond issuances of large, national financial institutions.