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Mortgage Servicing Rights (Tables)
6 Months Ended
Jun. 30, 2017
Mortgage Servicing Rights [Abstract]  
Summary of mortgage servicing rights capitalized and related amortization
($ in thousands) 2017  2016 
       
Carrying amount, January 1 $8,422  $7,152 
Mortgage servicing rights capitalized during the year  1,320   1,060 
Mortgage servicing rights amortization during the year  (521)  (482)
Net change in valuation allowance  (4)  (1,236)
Carrying amount, June 30 $9,217  $6,494 
         
Valuation allowance:        
January 1 $228  $296 
Increase/(reduction)  4   1,236 
         
June 30 $232  $1,532