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Goodwill and Intangibles (Tables)
12 Months Ended
Dec. 31, 2017
Goodwill and Intangibles [Abstract]  
Summary of carrying basis and accumulated amortization of recognized intangible assets
  2017  2016 
 Gross Carrying  Accumulated  Gross Carrying  Accumulated 
($ in thousands) Amount  Amortization  Amount  Amortization 
Core deposits intangible $4,698  $(4,682) $4,698  $(4,675)
Customer relationship intangible  200   (158)  200   (153)
     Banking intangibles  4,898   (4,840)  4,898   (4,828)