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Fair Value Measurements - Rollforward of Level 3 Assets (Details) - Level 3 - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Other derivatives    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance $ 398 $ 0
Change in fair value included in other comprehensive income (loss) (303) 0
Ending Balance 95 0
Municipal Bonds [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 1,022 1,076
Change in fair value included in other comprehensive income (loss) 43 3
Ending Balance $ 1,065 $ 1,079