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Fair Value of Financial Instruments - Changes in Fair Value of Level 3 Financial Assets (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Fair Value Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation    
Balance as of $ 15,912 $ 22,956
Total gains (losses) included in net income (417) (3,012)
Total gains (losses) included in other comprehensive income (3,539) (2,483)
Sales (718)  
Balance as of 11,238 17,461
Change in unrealized gains (losses) for the period included in net income for assets held at the end of the reporting period (417) (3,012)
Change in unrealized gains (losses) for the period included in other comprehensive income for assets held at the end of the reporting period (3,539) (2,483)
States and political subdivision bonds    
Fair Value Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation    
Balance as of 3,100 3,596
Total gains (losses) included in net income 0 0
Total gains (losses) included in other comprehensive income (580) (496)
Sales 0  
Balance as of 2,520 3,100
Change in unrealized gains (losses) for the period included in other comprehensive income for assets held at the end of the reporting period (580) (496)
Corporate bonds    
Fair Value Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation    
Balance as of 8,328 11,767
Total gains (losses) included in net income 0 0
Total gains (losses) included in other comprehensive income (2,959) (1,987)
Sales 0  
Balance as of 5,369 9,780
Change in unrealized gains (losses) for the period included in other comprehensive income for assets held at the end of the reporting period (2,959) (1,987)
Other investments    
Fair Value Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation    
Balance as of 4,484 7,593
Total gains (losses) included in net income (417) (3,012)
Total gains (losses) included in other comprehensive income 0 0
Sales (718)  
Balance as of 3,349 4,581
Change in unrealized gains (losses) for the period included in net income for assets held at the end of the reporting period $ (417) $ (3,012)