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Mortgage Servicing Rights (Tables)
3 Months Ended
Mar. 31, 2019
Mortgage Servicing Rights [Abstract]  
Summary of mortgage servicing rights capitalized and related amortization

($ in thousands) 2019  2018 
       
Carrying amount, January 1 $11,365  $9,907 
Mortgage servicing rights capitalized during the year  436   443 
Mortgage servicing rights amortization during the year  (255)  (246)
Net change in valuation allowance  (708)  92 
Carrying amount, March 31 $10,838  $10,196 
         
Valuation allowance:        
January 1 $212  $151 
Increase (reduction)  708   (92)
         
March 31 $920  $59