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Fair Value of Financial Instruments (Tables)
12 Months Ended
Dec. 31, 2012
Fair Value [Abstract]  
Assets and liabilities measured at fair value on a recurring basis
Assets and liabilities measured at fair value under ASC 820 on a recurring basis are summarized below:
 
   
Fair Value Measurements at
 
   
December 31, 2012 Using:
 
              
         
Significant
    
      
Quoted Prices in
  
Other
  
Significant
 
      
Active Markets for
  
Observable
  
Unobservable
 
   
Carrying
  
Identical Assets
  
Inputs
  
Inputs
 
   
Value
  
(Level 1)
  
(Level 2)
  
(Level 3)
 
(Dollars in thousands)
            
Securities available-for sale:
            
U.S. government-sponsored enterprises
 $263,108   -   263,108   - 
State and political subdivisions
  26,457   -   26,457   - 
Mortgage-backed securities and collateralized mortgage obligations - residential
  518,776   -   518,776   - 
Corporate bonds
  26,529   -   26,529   - 
Small Business Administration-guaranteed participation securities
  76,562   -   76,562     
Other securities
  660   10   650   - 
Total securities available-for-sale
 $912,092   10   912,082   - 
 
   
Fair Value Measurements at
 
   
December 31, 2011 Using:
 
              
         
Significant
    
      
Quoted Prices in
  
Other
  
Significant
 
      
Active Markets for
  
Observable
  
Unobservable
 
   
Carrying
  
Identical Assets
  
Inputs
  
Inputs
 
   
Value
  
(Level 1)
  
(Level 2)
  
(Level 3)
 
(Dollars in thousands)
            
Securities available-for sale:
            
U.S. government-sponsored enterprises
 $563,459   -   563,459   - 
State and political subdivisions
  43,968   -   43,968   - 
Mortgage-backed securities and collateralized mortgage obligations - residential
  204,023   -   204,023   - 
Corporate bonds
  96,608   -   96,608   - 
Other securities
  660   10   650   - 
Total securities available-for-sale
 $908,718   10   908,708   - 
Assets measured at fair value on a non-recurring basis
Assets measured at fair value on a non-recurring basis are summarized below:
 
   
Fair Value Measurements at
 
   
December 31, 2012 Using:
 
              
         
Significant
    
      
Quoted Prices in
  
Other
  
Significant
 
      
Active Markets for
  
Observable
  
Unobservable
 
   
Carrying
  
Identical Assets
  
Inputs
  
Inputs
 
   
Value
  
(Level 1)
  
(Level 2)
  
(Level 3)
 
(Dollars in thousands)
            
              
Other real estate owned
 $8,705   -   -   8,705 
Impaired Loans:
                
Commercial real estate
  4,690   -   -   4,690 
Real estate mortgage - 1 to 4 family:
                
First mortgages
  5,421   -   -   5,421 
Home Equity Loans
  67   -   -   67 
Home Equity Lines of Credit
  581   -   -   581 
 
Other real estate owned, which is carried at fair value less costs to sell, approximates $8.7 million at December 31, 2012 and consisted of $4.8 million of commercial real estate and $3.9 million of residential real estate properties. A valuation charge of $1.1 million is included in earnings for the year ended December 31, 2012.
 
Of the total impaired loans of $26.1 million at December 31, 2012, $10.8 million are collateral dependent and have had a chargeoff taken and are carried at fair value measured on a non-recurring basis. Due to the sufficiency of charge-offs taken on these loans and the adequacy of the underlying collateral, there were no specific valuation allowances for these loans at December 31, 2012. Gross charge-offs related to commercial impaired loans were $2.5 million for the year ended December 31, 2012, while gross residential impaired loan charge-offs amounted to $1.7 million.
 
   
Fair Value Measurements at
 
   
December 31, 2011 Using:
 
              
         
Significant
    
      
Quoted Prices in
  
Other
  
Significant
 
      
Active Markets for
  
Observable
  
Unobservable
 
   
Carrying
  
Identical Assets
  
Inputs
  
Inputs
 
   
Value
  
(Level 1)
  
(Level 2)
  
(Level 3)
 
(Dollars in thousands)
            
              
Other real estate owned
 $5,265   -   -   5,265 
Impaired Loans:
                
Commercial real estate
  7,457   -   -   7,457 
Real estate mortgage - 1 to 4 family:
                
First mortgages
  1,732   -   -   1,732 
Carrying amounts and estimated fair values of financial instruments
In accordance with ASC 825, the carrying amounts and estimated fair values of financial instruments, at December 31, 2012 and 2011 are as follows:
 
(dollars in thousands)
    
Fair Value Measurements at
 
   
Carrying
  
December 31, 2012 Using:
 
   
Value
  
Level 1
  
Level 2
  
Level 3
  
Total
 
Financial assets:
               
Cash and cash equivalents
 $544,016   544,016   -   -   544,016 
Securities available for sale
  912,092   10   912,082   -   912,092 
Held to maturity securities
  143,426   -   151,126   -   151,126 
Federal Reserve Bank and Federal Home Loan Bank stock
  9,632   N/A   N/A   N/A   N/A 
Net loans
  2,636,806   -   -   2,771,705   2,771,705 
Accrued interest receivable
  11,752   -   4,114   7,638   11,752 
Financial liabilities:
                    
Demand deposits
  300,544   300,544   -   -   300,544 
Interest bearing deposits
  3,503,649   2,426,170   1,079,663   -   3,505,833 
Short-term borrowings
  159,846   -   159,846   -   159,846 
Accrued interest payable
  449   103   346   -   449 
 
   
As of
 
(dollars in thousands)
 
December 31, 2011
 
   
Carrying
  
Fair
 
   
Value
  
Value
 
Financial assets:
      
Cash and cash equivalents
 $532,943   532,943 
Securities available for sale
  908,718   908,718 
Held to maturity securities
  216,288   224,440 
Federal Reserve Bank and Federal Home Loan Bank stock
  9,004   N/A 
Loans
  2,472,586   2,590,803 
Accrued interest receivable
  13,952   13,952 
Financial liabilities:
        
Demand deposits
  267,776   267,776 
Interest bearing deposits
  3,468,197   3,474,558 
Short-term borrowings
  147,563   147,563 
Accrued interest payable
  762   762