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Mortgage Servicing Rights (Tables)
3 Months Ended
Mar. 31, 2023
Mortgage Servicing Rights [Abstract]  
Schedule of mortgage servicing rights capitalized and related amortization
   Three Months Ended
March 31,
 
($ in thousands)  2023   2022 
         
Carrying amount, beginning of year  $13,503   $12,034 
Mortgage servicing rights capitalized during the year   280    758 
Mortgage servicing rights amortization during the year   (291)   (547)
Net change in valuation allowance   56    890 
Carrying amount, end of year  $13,548   $13,135 
           
Valuation allowance:          
Beginning of year  $177   $1,456 
Increase (reduction)   (56)   (890)
End of year  $121   $566 
           
Fair value, beginning of period  $15,754   $12,629 
Fair value, end of period  $16,911   $14,433