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Mortgage Servicing Rights (Tables)
6 Months Ended
Jun. 30, 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   1,011    1,269 
Mortgage servicing rights amortization during the year   (714)   (613)
Net change in valuation allowance   (1,398)   70 
Carrying amount, June 30  $10,264   $10,633 
           
Valuation allowance:          
January 1  $212   $151 
Increase (reduction)   1,398    (70)
           
June 30  $1,610   $81