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Mortgage Banking and Servicing Rights (Tables)
12 Months Ended
Dec. 31, 2016
Mortgage Banking and Servicing Rights [Abstract]  
Summary of mortgage servicing rights capitalized and related amortization
($ in thousands) 2016  2015 
       
Carrying amount, beginning of year $7,152  $5,704 
Mortgage servicing rights capitalized during the year  2,542   2,214 
Mortgage servicing rights amortization during the year  (1,340)  (882)
Net change in valuation allowance  68   116 
Carrying amount, end of year $8,422  $7,152 
         
Valuation allowance:        
Beginning of year $296  $412 
Reduction  (68)  (116)
         
End of year $228  $296 
         
Fair Value, beginning of period $7,760  $6,358 
Fair Value, end of period $9,656  $7,760