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Short-Term and Long-Term Borrowings - Lines of Credit (Details) - USD ($)
Jun. 30, 2022
Dec. 31, 2021
Line of Credit Facility [Line Items]    
Borrowing Limit $ 340,000,000  
Amount Outstanding 0 $ 91,163,000
Letters of Credit 7,844,000  
Amount Available 332,156,000 235,678,000
OTC Credit Agreement    
Line of Credit Facility [Line Items]    
Borrowing Limit 170,000,000  
Amount Outstanding 0  
Letters of Credit 0  
Amount Available 170,000,000 147,363,000
OTP Credit Agreement    
Line of Credit Facility [Line Items]    
Borrowing Limit 170,000,000  
Amount Outstanding 0  
Letters of Credit 7,844,000  
Amount Available $ 162,156,000 $ 88,315,000