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Mortgage Banking and Servicing Rights (Tables)
 12 Months Ended
Dec. 31, 2017
Mortgage Banking and Servicing Rights [Abstract]  
Summary of mortgage servicing rights capitalized and related amortization
($ in thousands) 2017  2016 
Carrying amount, beginning of year $8,422  $7,152 
Mortgage servicing rights capitalized during the year  2,540   2,542 
Mortgage servicing rights amortization during the year  (1,132)  (1,340)
Net change in valuation allowance  77   68 
Carrying amount, end of year $9,907  $8,422 
         
Valuation allowance:        
Beginning of year $228  $296 
Reduction  (77)  (68)
End of year $151  $228 
Fair Value, beginning of period $9,656  $7,760 
Fair Value, end of period $11,338  $9,656