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Mortgage Servicing Rights (Tables)
9 Months Ended
Sep. 30, 2020
Mortgage Servicing Rights [Abstract]  
Schedule of mortgage servicing rights capitalized and related amortization
($ in thousands)  2020   2019 
         
Carrying amount, January 1  $11,017   $11,365 
Mortgage servicing rights capitalized during the year   3,971    1,895 
Mortgage servicing rights amortization during the year   (3,479)   (1,415)
Net change in valuation allowance   (2,974)   (1,398)
Carrying amount, September 30  $8,535   $10,447 
           
Valuation allowance:          
January 1  $1,306   $212 
Increase   2,974    1,398 
September 30  $4,280   $1,610