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Goodwill and Intangibles (Tables)
12 Months Ended
Dec. 31, 2016
Goodwill and Intangibles [Abstract]  
Summary of carrying basis and accumulated amortization of recognized intangible assets
  2016  2015 
($ in thousands) Gross
Carrying
Amount
  Accumulated
Amortization
  Gross
Carrying
Amount
  Accumulated
Amortization
 
Core deposits intangible $4,698  $(4,675) $4,698  $(4,668)
Customer relationship intangible  200   (153)  200   (148)
Banking intangibles  4,898   (4,828)  4,898   (4,816)