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Mortgage Servicing Rights (Tables)
9 Months Ended
Sep. 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  2,042   1,779 
Mortgage servicing rights amortization during the year  (864)  (879)
Net change in valuation allowance  (40)  (1,165)
Carrying amount, September 30 $9,560  $6,887 
         
Valuation allowance:        
January 1 $228  $296 
Increase/(reduction)  40   1,165 
         
September 30 $268  $1,461