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Goodwill and Other Intangible Assets (Tables)
 6 Months Ended
Jun. 30, 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

The following is a summary of the gross carrying amount and accumulated amortization of amortizable intangible assets as of June 30, 2017, December 31, 2016, and June 30, 2016 and the carrying amount of unamortized intangible assets as of those same dates.

 

   June 30, 2017   December 31, 2016   June 30, 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    866    2,369    746    2,369    624 
   Core deposit premiums   18,520    9,404    9,730    8,143    8,560    7,660 
   Other   1,032    381    1,032    224    1,032    65 
        Total  $21,921    10,651    13,131    9,113    11,961    8,349 
                               
SBA servicing asset  $862         415         —      
                               
Unamortizable intangible assets:                              
   Goodwill  $139,124         75,042         73,541      
Schedule of the estimated amortization expense for the five succeeding fiscal years

These estimates are subject to change in future periods to the extent management determines it is necessary to make adjustments to the carrying value or estimated useful lives of amortized intangible assets.

 

($ in thousands)

 

  Estimated Amortization
Expense		 
July 1 to December 31, 2017  $1,615 
2018   2,862 
2019   2,314 
2020   1,750 
2021   1,288 
Thereafter   1,441 
         Total  $11,270