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Fair Value (Tables)
12 Months Ended
Dec. 31, 2012
Fair Value [Abstract]  
Summary of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis
    Readily Available Market Prices
(Level 1)
  Observable Market Data
(Level 2)
  Company Determined Fair Value
(Level 3)
  Total
At December 31, 2012
                                   
Financial Assets:
                                   
Available for sale debt securities:
                                   
Obligations of states and political subdivisions   $ -     $ 33,040     $ -     $ 33,040  
Mortgage-backed securities issued or guaranteed by U.S. government
sponsored enterprises
    -       358,148       -       358,148  
Collateralized mortgage obligations issued or guaranteed by U.S. government
sponsored enterprises
    -       381,688       -       381,688  
Private issue collateralized
mortgage obligations
    -       8,174       -       8,174  
Trading account assets     2,300       -       -       2,300  
Customer interest rate swap agreement     -       496       -       496  
Financial Liabilities:
                                   
Interest rate swap agreements     -       11,580       -       11,580  
At December 31, 2011
                                   
Financial Assets:
                                   
Available for sale debt securities:
                                   
Obligations of U.S. government
sponsored enterprises
  $ -     $ 30,107     $ -     $ 30,107  
Obligations of states and political subdivisions     -       39,758       -       39,758  
Mortgage-backed securities issued or guaranteed by U.S. government sponsored enterprises     -       376,934       -       376,934  
Collateralized mortgage obligations issued or guaranteed by U.S. government sponsored enterprises     -       128,450       -       128,450  
Private issue collateralized mortgage obligations     -       10,641       -       10,641  
Equity securities     -       4,146       -       4,146  
Trading account assets     2,244       -       -       2,244  
Customer interest rate swap agreement     -       211       -       211  
Financial Liabilities:
                                   
Interest rate swap agreements     -       11,387       -       11,387  
Summary of Assets Measured at Fair Value on Non Recurring Basis
    Readily Available Market Prices
(Level 1)
  Observable Market Data
(Level 2)
  Company Determined Fair Value
(Level 3)
  Total
At December 31, 2012
                                   
Assets:
                                   
Collateral-dependent impaired loans   $ -     $ -     $ 9,183     $ 9,183  
Other real estate owned     -       -       1,313       1,313  
Mortgage servicing rights     -       879       -       879  
At December 31, 2011
                                   
Assets:
                                   
Impaired loans   $ -     $ -     $ 18,183     $ 18,183  
Goodwill     -       -       276       276  
Other real estate owned     -       -       1,682       1,682  
Mortgage servicing rights     -       1,138       -       1,138  
Valuation Methodology and Unobservable Inputs for Level Three Assets Measured at Fair Value on Non Recurring Basis
    Fair Value   Valuation Methodology   Unobservable input   Discount Range
Collateral-dependent impaired loans:(1)
                                   
Partially charged-off   $ 3,524       Market approach appraisal of collateral       Management adjustment
of appraisal
      10 - 30
Specifically reserved   $ 5,659       Market approach appraisal of collateral       Management adjustment
of appraisal
      - (2) 
Other real estate owned   $ 1,313       Market approach appraisal of collateral       Management adjustment
of appraisal
      10 - 30
                         Estimated selling cost       6 - 10
  (1) Does not include impaired loans that are measured by the present value of expected future cash flows discounted at the loan's effective interest rate.
  (2) The specific reserve for collateral-dependent impaired loans is determined by any deficit of 75% of collateral value below the recorded investment.
Carrying Amounts and Estimated Fair Value for Financial Instrument Assets and Liabilities
            Fair Value Measurement
at December 31, 2012
     Carrying Amount   Fair Value   Readily Available Market Prices
(Level 1)
  Observable Market Prices
(Level 2)
  Company Determined Market Prices
(Level 3)
Financial assets:
                                   
Cash and due from banks   $ 58,290     $ 58,290     $ 58,290     $ -     $ -  
Securities available for sale     781,050       781,050       -       781,050       -  
FHLB and Federal Reserve Bank stock     21,034       21,034       21,034       -       -  
Trading account assets     2,300       2,300       2,300       -       -  
Loans receivable, net of allowance
    1,540,822       1,557,320       -       -       1,557,320  
Mortgage servicing rights     542       879       -       879       -  
Interest receivable     6,215       6,215       -       6,215       -  
Investment in CCTA and UBCT     1,331       1,331       -       -       1,331  
Customer interest rate swap agreement     496       496       -       496       -  
            Fair Value Measurement
at December 31, 2012
     Carrying Amount   Fair Value   Readily Available Market Prices
(Level 1)
  Observable Market Prices
(Level 2)
  Company Determined Market Prices
(Level 3)
Financial liabilities:
                                   
Deposits     1,929,469       1,936,446       1,339,290       597,156       -  
FHLB advances     56,404       60,813       -       60,813       -  
Commercial repurchase agreements     66,187       69,067       -       69,067       -  
Other borrowed funds     193,753       193,753       193,753       -       -  
Junior subordinated debentures     43,819       43,819       -       43,819       -  
Interest payable     905       905       905       -       -  
Interest rate swap agreements     11,580       11,580       -       11,580       -  

The following table presents the carrying amounts and estimated fair value for financial instrument assets and liabilities at December 31, 2011:

    December 31, 2011
     Carrying Amount   Fair Value
Financial assets:
                 
Cash and due from banks   $ 39,325     $ 39,325  
Securities available for sale     590,036       590,036  
FHLB and Federal Reserve Bank stock     21,962       21,962  
Trading account assets     2,244       2,244  
Loans held for sale     6,061       6,268  
Loans receivable, net of allowance     1,491,017       1,510,277  
Mortgage servicing rights     768       1,138  
Interest receivable     6,431       6,431  
Investment in CCTA and UBCT     1,331       1,331  
Customer interest rate swap agreement     211       211  
Financial liabilities:
                 
Deposits     1,591,366       1,600,222  
FHLB advances     136,860       143,642  
Commercial repurchase agreements     71,243       75,342  
Other borrowed funds     204,413       204,413  
Junior subordinated debentures     43,717       43,717  
Interest payable     1,093       1,093  
Interest rate swap agreements     11,387       11,387