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Mortgage Servicing Rights (Tables)
3 Months Ended
Mar. 31, 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  502   488 
Mortgage servicing rights amortization during the year  (246)  (218)
Net change in valuation allowance  92   35 
Carrying amount, March 31 $10,255  $8,727 
         
Valuation allowance:        
     January 1 $151  $228 
     Increase/(reduction)  (92)  (35)
         
     March 31 $59  $193