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Mortgage Servicing Rights (Tables)
9 Months Ended
Sep. 30, 2018
Mortgage Servicing Rights [Abstract]  
Summary of mortgage servicing rights capitalized and related amortization
($ in thousands) 2018  2017 
       
Carrying amount, January 1 $9,907  $8,422 
Mortgage servicing rights capitalized during the year  2,288   2,042 
Mortgage servicing rights amortization during the year  (931)  (864)
Net change in valuation allowance  8   (40)
Carrying amount, September 30 $11,272  $9,560 
         
Valuation allowance:        
January 1 $151  $228 
Increase/(reduction)  (8)  40 
         
September 30 $143  $268