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Goodwill and Other Intangible Assets (Tables)
 9 Months Ended
Sep. 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
   September 30, 2016   December 31, 2015   September 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    668    678    550   $678    539 
   Core deposit premiums   9,730    7,902    8,560    7,352    8,560    7,183 
   Other   1,032    166    —    —    —    — 
        Total  $13,131    8,736    9,238    7,902   $9,238    7,722 
                               
SBA servicing asset  $208         —        $—      
                               
Unamortizable intangible assets:                              
   Goodwill  $75,392         65,835        $65,835      
Schedule of the estimated amortization expense for the five succeeding fiscal years

($ in thousands)

 

  Estimated Amortization
Expense		 
October 1 to December 31, 2016  $376 
2017   1,240 
2018   874 
2019   665 
2020   437 
Thereafter   803 
         Total  $4,395