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Short-Term and Long-Term Borrowings - Lines of Credit (Details) - USD ($)
Sep. 30, 2023
Dec. 31, 2022
Line of Credit Facility [Line Items]    
Borrowing Limit $ 340,000,000  
Amount Outstanding 51,495,000 $ 8,204,000
Letters of Credit 9,573,000  
Amount Available 278,932,000 322,223,000
OTC Credit Agreement    
Line of Credit Facility [Line Items]    
Borrowing Limit 170,000,000  
Amount Outstanding 0  
Letters of Credit 0  
Amount Available 170,000,000 170,000,000
OTP Credit Agreement    
Line of Credit Facility [Line Items]    
Borrowing Limit 170,000,000  
Amount Outstanding 51,495,000  
Letters of Credit 9,573,000  
Amount Available $ 108,932,000 $ 152,223,000