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Short-Term Borrowings (Tables)
9 Months Ended
Sep. 30, 2024
Short-Term Borrowings [Abstract]  
Schedule of Lines of Credit The Company maintains lines of credit aggregating $140.0 million.
   (Millions)         
   As of September 30, 2024         
   Outstanding  Available  Maximum  Credit Type  Renewal Date
Bank of America  $
   $60.0   $60.0   Uncommitted  January 24, 2025
PNC Bank   17.5   $50.5    68.0   Committed  January 31, 2026
CoBank, ACB   
    12.0    12.0   Committed  May 20, 2026
   $17.5   $122.5   $140.0       
Schedule of Credit Lines and the Weighted Average Interest Rates The weighted average daily amounts of borrowings outstanding under these credit lines and the weighted average interest rates on those amounts were as follows:
   (In Thousands)
   Three Months Ended  Nine Months Ended
   September 30,  September 30,
   2024  2023  2024  2023
Average Daily Amounts Outstanding  $23,476   $25,015   $44,620   $32,860 
Weighted Average Interest Rates   6.41%    6.37%    6.42%    5.89%