Employee Benefits (Details 5) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	$ 17,459	$ 18,166
Fixed income
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	13,638	10,136
Equity
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	3,821	8,030
Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	0	0
Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	17,459	18,166
Inputs (Level 2) | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	13,638	10,136
Inputs (Level 2) | Equity
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	3,821	8,030
Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	0	0
Inputs (Level 3) | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	0	0
Inputs (Level 3) | Equity
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	$ 0	$ 0