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Goodwill and Other Intangible Assets (Tables)
 9 Months Ended
Sep. 30, 2018
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, 2018   December 31, 2017   September 30, 2017 
($ in thousands)  Gross Carrying
Amount		   Accumulated
Amortization		   Gross Carrying
Amount		   Accumulated
Amortization		   Gross Carrying
Amount		   Accumulated
Amortization		 
Amortizable intangible assets:                              
   Customer lists  $6,013    1,459    6,013    1,090    6,013    953 
   Core deposit intangibles   28,440    15,300    28,280    11,475    18,520    10,084 
   SBA servicing asset   4,949    761    2,194    207    1,418    112 
   Other   1,303    906    1,303    581    1,303    471 
        Total  $40,705    18,426    37,790    13,353    27,254    11,620 
                               
Unamortizable intangible                              
    assets:                              
   Goodwill  $232,458         233,070         144,667      

 
Schedule of the estimated amortization expense for the five succeeding fiscal years

 

($ in thousands)

 

  Estimated Amortization
Expense		 
October 1 to December 31, 2018  $1,589 
2019   5,570 
2020   4,481 
2021   3,492 
2022   2,411 
Thereafter   4,736 
         Total  $22,279