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Goodwill and Other Intangible Assets (Tables)
 6 Months Ended
Jun. 30, 2016
Goodwill And Other Intangible Assets [Abstract]  
Summary of the gross carrying amount and accumulated amortization of amortizable intangible assets and the carrying amount of unamortized intangible assets
    June 30, 2016     December 31, 2015     June 30, 2015  
($ in thousands)   Gross Carrying
Amount		     Accumulated 
Amortization		     Gross Carrying 
Amount		     Accumulated 
Amortization		     Gross Carrying 
Amount		     Accumulated 
Amortization		  
Amortizable intangible assets:                                                
   Customer lists   $ 2,369       624       678       550       678       528  
   Core deposit premiums     8,560       7,660       8,560       7,352       8,560       7,013  
   Other     1,032       65       —       —       —       —  
        Total   $ 11,961       8,349       9,238       7,902       9,238       7,541  
                                                 
Unamortizable intangible assets:                                                
   Goodwill   $ 73,541               65,835               65,835          
Schedule of the estimated amortization expense for the five succeeding fiscal years

($ in thousands)

 

   Estimated Amortization 
Expense		  
July 1 to December 31, 2016   $ 587  
2017     934  
2018     624  
2019     471  
2020     301  
Thereafter     695  
         Total   $ 3,612