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Mortgage Servicing Rights (Tables)
6 Months Ended
Jun. 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  1,350   1,320 
Mortgage servicing rights amortization during the year  (613)  (521)
Net change in valuation allowance  70   (4)
Carrying amount, June 30 $10,714  $9,217 
         
Valuation allowance:        
     January 1 $151  $228 
     Increase/(reduction)  (70)  4 
         
     June 30 $81  $232