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Goodwill and Intangibles (Tables)
12 Months Ended
Dec. 31, 2018
Goodwill and Intangibles [Abstract]  
Summary of carrying basis and accumulated amortization of recognized intangible assets
  2018  2017 
($ in thousands) Gross Carrying  Accumulated  Gross Carrying  Accumulated 
  Amount  Amortization  Amount  Amortization 
Core deposits intangible $4,698  $(4,688) $4,698  $(4,682)
Customer relationship intangible  200   (162)  200   (158)
Banking intangibles $4,898  $(4,850) $4,898  $(4,840)