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Mortgage Banking and Servicing Rights (Tables)
12 Months Ended
Dec. 31, 2018
Mortgage Banking and Servicing Rights [Abstract]  
Summary of mortgage servicing rights capitalized and related amortization
($ in thousands) 2018  2017 
       
Carrying amount, beginning of year $9,907  $8,422 
Mortgage servicing rights capitalized during the year  2,749   2,540 
Mortgage servicing rights amortization during the year  (1,230)  (1,132)
Net change in valuation allowance  (61)  77 
Carrying amount, end of year $11,365  $9,907 
         
Valuation allowance:        
Beginning of year $151  $228 
Increase (reduction)  61   (77)
End of year $212  $151 
         
Fair value, beginning of period $11,338  $9,656 
Fair value, end of period $12,672  $11,338