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Core Deposits and Other Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2014
Goodwill and Core Deposits and Other Intangible Assets [Abstract]  
Summary of carrying basis and accumulated amortization of recognized intangible assets

   2014  2013 
 ($ in thousands) Gross Carrying  Accumulated  Gross Carrying  Accumulated 
   Amount  Amortization  Amount  Amortization 
 Core deposits intangible $4,698  $(4,473) $4,698  $(4,107)
 Customer relationship intangible  200   (142)  200   (136)
 Banking intangibles  4,898   (4,615)  4,898   (4,243)
                  
                  
 Purchased software - Banking  1,289   (943)  1,160   (785)
 Purchased software - Data Processing/other  235   (206)  243   (197)
 Purchased software  1,524   (1,149)  1,403   (982)
 Total $6,422  $(5,764) $6,301  $(5,225)
Summary of estimated amortization expense
 
  ($ in thousands)   2015     2016     2017     2018     2019  
                                 
  Core deposit intangible   $ 195     $ 8     $ 7     $ 5     $ 5  
  Customer relationship intangible     6       5       5       4       4  
  Banking intangibles     201       13       12       9       9  
                                           
                                           
  Purchased software - Banking     164       143       37       2       -  
  Purchased software - Data Processing     5       4       3       3       3  
  Purchased Software     169       147       40       5       3  
  Total   $ 370     $ 160     $ 52     $ 14     $ 12