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Employee Benefit Plans - Schedule of Net Periodic Benefit Cost Not Yet Recognized (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Retirement Benefits, Description [Abstract]      
Unamortized net actuarial gain (loss) $ 47 $ 47 $ (186)
Deferred tax benefit (expense) (10) (10) 39
Net unrecognized postretirement benefits included in accumulated other comprehensive income (loss) $ 37 $ 37 $ (147)