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Components of Net Periodic Pension Cost (Tables)
3 Months Ended
Mar. 31, 2022
Retirement Benefits [Abstract]  
Schedule of Net Benefit Costs [Table Text Block]
   Three Months Ended   Affected Line Item in the Consolidated
   March 31,   Statements of Income
   2022   2021    
   (dollars in thousands)    
Service cost  $
-
   $
-
    
Interest cost   78    71   Other components of net periodic pension expense
Expected return on plan assets   (237)   (213)  Other components of net periodic pension expense
Net amortization   16    75   Other components of net periodic pension expense
   Total periodic pension income  $(143)  $(67)