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Short-Term and Long-Term Borrowings - Lines of Credit (Details) - USD ($)
Dec. 31, 2022
Dec. 31, 2021
Line of Credit Facility [Line Items]    
Line Limit $ 340,000,000  
Amount Outstanding 8,204,000 $ 91,163,000
Letters of Credit 9,573,000  
Amount Available 322,223,000 235,678,000
OTC Credit Agreement    
Line of Credit Facility [Line Items]    
Line Limit 170,000,000  
Amount Outstanding 0  
Letters of Credit 0  
Amount Available 170,000,000 147,363,000
OTP Credit Agreement    
Line of Credit Facility [Line Items]    
Line Limit 170,000,000  
Amount Outstanding 8,204,000  
Letters of Credit 9,573,000  
Amount Available $ 152,223,000 $ 88,315,000