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Note 8 - Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2013
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
(dollars in thousands)
 
Quoted Prices
(Level 1)
 
Significant Other
Observable Inputs
(Level 2)
 
Significant Other
Unobservable Inputs
(Level 3)
 
Total
(Fair Value)
 
March 31, 2013
                       
Investment securities available for sale:
                       
U. S. Government agency securities
  $ -     $ 40,124     $ -     $ 40,124  
Residential mortgage backed securities
    -       191,578       -       191,578  
Municipal bonds
    -       86,380       -       86,380  
Other equity investments
    120       -       229       349  
Residential mortgage loans held for sale
    -       132,698       -       132,698  
Total assets measured at fair value on a recurring basis as of March 31, 2013
  $ 120     $ 450,780     $ 229     $ 451,129  
(dollars in thousands)
 
Quoted Prices
(Level 1)
 
Significant Other
Observable Inputs
(Level 2)
 
Significant Other
Unobservable
Inputs (Level 3)
 
Total
(Fair Value)
 
December 31, 2012
                               
Investment securities available for sale:
                               
U. S. Government agency securities
  $ -     $ 49,082     $ -     $ 49,082  
Residential mortgage backed securities
    -       173,083       -       173,083  
Municipal bonds
    -       77,313       -       77,313  
Other equity investments
    112       -       230       342  
Residential mortgage loans held for sale
    -       226,923       -       226,923  
Total assets measured at fair value on a recurring basis as of December 31, 2012
  $ 112     $ 526,401     $ 230     $ 526,743  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
   
Other Equity Investments
 
(dollars in thousands)
 
March 31, 2013
   
December 31, 2012
 
Balance, beginning of period
  $ 226     $ 226  
Total realized and unrealized gains and losses:
               
Included in other comprehensive income
    3       4  
Purchases
    -       -  
Principal redemption
    -       -  
Balance, end of period
  $ 229     $ 230  
Fair Value Measurements, Nonrecurring [Table Text Block]
(dollars in thousands)
 
Quoted Prices
(Level 1)
 
Significant Other
Observable Inputs
(Level 2)
 
Significant Other
Unobservable
Inputs (Level 3)
 
Total
(Fair Value)
 
March 31, 2013
                       
Impaired loans:
                       
Commercial
  $ -     $ 4,553     $ 3,440     $ 7,993  
Investment - commercial real estate
    -       3,459       1,948       5,407  
Owner occupied - commercial real estate
    -       6,449       -       6,449  
Real estate mortgage - residential
    -       -       691       691  
Construction - commercial and residential
    -       11,995       9,964       21,959  
Home equity
    -       481       -       481  
Other consumer
    -       -       -       -  
Other real estate owned
    -       5,449       3,750       9,199  
Total assets measured at fair value on a nonrecurring basis as of
   March 31, 2013
  $ -     $ 32,386     $ 19,793     $ 52,179  
(dollars in thousands)
 
Quoted Prices
(Level 1)
 
Significant Other
Observable Inputs
(Level 2)
 
Significant Other
Unobservable
Inputs (Level 3)
 
Total
(Fair Value)
 
December 31, 2012
                               
Impaired loans:
                               
Commercial
  $ -     $ 5,198     $ 4,050     $ 9,248  
Investment - commercial real estate
    -       3,924       1,676       5,600  
Owner occupied - commercial real estate
    -       6,452       207       6,659  
Real estate mortgage - residential
    -       -       699       699  
Construction - commercial and residential
    -       12,937       10,298       23,235  
Home equity
    -       510       3       513  
Other consumer
    -       -       43       43  
Other real estate owned
    -       4,969       330       5,299  
Total assets measured at fair value on a nonrecurring basis as of
   December 31, 2012
  $ -     $ 33,990     $ 17,306     $ 51,296  
Fair Value, by Balance Sheet Grouping [Table Text Block]
               
Fair Value Measurements
 
               
Quoted Prices in
Active Markets for
Identical Assets or Liabilities
   
Significant Other Observable Inputs
   
Significant 
Unobservable
Inputs
 
(dollars in thousands)
 
Carrying Value
   
Fair Value
   
(Level 1)
   
(Level 2)
   
(Level 3)
 
March 31, 2013
                             
Assets
                             
Cash and due from banks
  $ 7,123     $ 7,123     $ -     $ 7,123     $ -  
Federal funds sold
    5,811       5,811       -       5,811       -  
Interest bearing deposits with other banks
    257,957       257,957       -       257,957       -  
Investment securities
    318,431       318,431       120       318,082       229  
                                         
Federal Reserve and Federal Home Loan Bank stock
    11,154       11,154       -       11,154       -  
Loans held for sale
    132,698       132,698       -       132,698       -  
Loans
    2,548,024       2,589,295       -       26,937       2,562,358  
Other earning assets
    14,229       14,229       -       14,229       -  
Liabilities
                                       
Noninterest bearing deposits
    756,177       756,177       -       756,177       -  
Interest bearing deposits
    2,056,753       2,057,317       -       2,057,317       -  
Borrowings
    131,964       133,909       -       133,909       -  
                                         
December 31, 2012
                                       
Assets
                                       
Cash and due from banks
  $ 7,439     $ 7,439     $ -     $ 7,439     $ -  
Federal funds sold
    7,852       7,852       -       7,852       -  
Interest bearing deposits with other banks
    324,043       324,043       -       324,043       -  
Investment securities
    299,820       299,820       112       299,478       230  
                                         
Federal Reserve and Federal Home Loan Bank stock
    10,694       10,694       -       10,694       -  
Loans held for sale
    226,923       226,923       -       226,923       -  
Loans
    2,493,095       2,515,409       -       29,021       2,486,388  
Other earning assets
    14,135       14,135       -       14,135       -  
Liabilities
                                       
Noninterest bearing deposits
    881,390       881,390       -       881,390       -  
Interest bearing deposits
    2,015,832       2,017,623       -       2,017,623       -  
Borrowings
    140,638       142,765       -       142,765       -