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EMPLOYEE BENEFIT PLANS - Pre-tax amounts recognized in other comprehensive income (Details) - Retirement Income Plan - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]      
Net loss (gain) $ 395 $ (243) $ 474
Amortization of net loss (81) (91) (84)
Net transition obligation (asset) 0 0 0
Amount recognized in accumulated other comprehensive income $ 314 $ (334) $ 390