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Mortgage Banking and Servicing Rights (Tables)
12 Months Ended
Dec. 31, 2019
Mortgage Servicing Rights [Abstract]  
Servicing Asset at Amortized Cost [Table Text Block]
($ in thousands)  2019   2018 
         
Carrying amount, beginning of year  $11,365   $9,907 
Mortgage servicing rights capitalized during the year   2,872    2,749 
Mortgage servicing rights amortization during the year   (2,126)   (1,230)
Net change in valuation allowance   (1,094)   (61)
Carrying amount, end of year  $11,017   $11,365 
           
Valuation allowance:          
Beginning of year  $212   $151 
Increase (reduction)   1,094    61 
End of year  $1,306   $212 
           
Fair value, beginning of period  $12,672   $11,338 
Fair value, end of period  $11,864   $12,672