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Intangible Assets
6 Months Ended
Jun. 30, 2011
Intangible Assets [Abstract]  
Intangible Assets
(5)   Intangible Assets
     A summary of other intangible assets at June 30, 2011 and December 31, 2010, respectively is as follows:
                                                 
    June 30, 2011   December 31, 2010
    Gross                   Gross        
    Carrying   Accumulated   Net   Carrying   Accumulated   Net
    Amount   Amortization   Amount   Amount   Amortization   Amount
 
Amortizable intangible assets:
                                               
Core deposit intangible
  $ 4,795,224     $ (4,044,428 )   $ 750,796     $ 7,060,224     $ (6,082,715 )   $ 977,509  
Mortgage servicing rights
    3,084,915       (813,000 )     2,271,915       3,067,368       (711,378 )     2,355,990  
 
Total intangible assets
  $ 7,880,139     $ (4,857,428 )   $ 3,022,711     $ 10,127,592     $ (6,794,093 )   $ 3,333,499  
 
     Changes in the net carrying amount of other intangible assets for the three months ended June 30, 2011 are as follows:
                 
    Core Deposit   Mortgage
    Intangible   Servicing
    Asset   Rights
 
Balance at December 31, 2010
  $ 977,509     $ 2,355,990  
Additions
          220,554  
Amortization
    (226,713 )     (304,629 )
 
Balance at June 30, 2011
  $ 750,796     $ 2,271,915  
 
     Mortgage servicing rights (MSRs) are amortized over the shorter of 7 years or the life of the loan. They are periodically reviewed for impairment and if impairment is indicated, recorded at fair value. At June 30, 2011 and December 31, 2010, no temporary impairment was recognized. The fair value of MSRs is based on the present value of expected cash flows, as further discussed in Fair Value of Financial Instruments. Mortgage loans serviced for others totaled approximately $300,040,000 and $298,325,000 at June 30, 2011 and December 31, 2010, respectively. Included in other noninterest income were real estate servicing fees for the three months ended June 30, 2011 and 2010 of $211,000, and $204,000, respectively, and for the six months ended June 30, 2011 and 2010 of $390,000 and $396,000, respectively.
     The aggregate amortization expense of intangible assets subject to amortization for the three and six months ended June 30, 2011 and 2010 is as follows:
                                 
    For the Three Months Ended   For the Six Months Ended
    June 30,   June 30,
Aggregate amortization expense   2011   2010   2011   2010
 
Core deposit intangible asset
  $ 108,687     $ 139,906     $ 226,713     $ 290,425  
Mortgage servicing rights
    155,390       152,102       304,629       286,976  
     Our Company’s amortization expense on intangible assets in any given period may be different from the estimated amounts depending upon the acquisition of intangible assets, changes in mortgage interest rates, prepayment rates and other market conditions. The following table shows the estimated future amortization expense based on existing asset balances and the interest rate environment as of June 30, 2011 for the next five years:
                 
    Core Deposit   Mortgage
    Intangible   Servicing
    Asset   Rights
 
2011
  $ 208,050     $ 230,000  
2012
    408,062       435,000  
2013
    134,684       354,000  
2014
          288,000  
2015
          235,000