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Short-Term and Long-Term Borrowings - Lines of Credit (Details) - USD ($)
Dec. 31, 2021
Dec. 31, 2020
Line of Credit Facility [Line Items]    
Line Limit $ 340,000,000  
Amount Outstanding 91,163,000 $ 80,997,000
Letters of Credit 13,159,000  
Amount Available 235,678,000 244,902,000
OTC Credit Agreement    
Line of Credit Facility [Line Items]    
Line Limit 170,000,000  
Amount Outstanding 22,637,000  
Letters of Credit 0  
Amount Available 147,363,000 104,834,000
OTP Credit Agreement    
Line of Credit Facility [Line Items]    
Line Limit 170,000,000  
Amount Outstanding 68,526,000  
Letters of Credit 13,159,000  
Amount Available $ 88,315,000 $ 140,068,000