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Goodwill and Other Intangible Assets (Tables)
 3 Months Ended
Mar. 31, 2017
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
   March 31, 2017   December 31, 2016   March 31, 2016 
($ in thousands)  Gross Carrying
Amount		   Accumulated
Amortization		   Gross Carrying
Amount		   Accumulated
Amortization		   Gross Carrying
Amount		   Accumulated
Amortization		 
Amortizable intangible assets:                              
   Customer lists  $2,369    806    2,369    746    1,269    572 
   Core deposit premiums   18,520    8,580    9,730    8,143    8,560    7,506 
   Other   1,032    303    1,032    224    92    10 
        Total  $21,921    9,689    13,131    9,113    9,921    8,088 
                               
SBA servicing asset  $579         415         —      
                               
Unamortizable intangible assets:                              
   Goodwill  $142,872         75,042         67,528      
Schedule of the estimated amortization expense for the five succeeding fiscal years

($ in thousands)

 

  Estimated Amortization
Expense		 
April 1 to December 31, 2017  $2,579 
2018   2,862 
2019   2,314 
2020   1,750 
2021   1,288 
Thereafter   1,439 
         Total  $12,232