Employee Benefits (Details 2) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	$ 18,704	$ 17,459
Pension plan | Investment in separate accounts fixed income
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	14,406	13,638
Pension plan | Investment in separate accounts equity
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	4,298	3,821
Level 1 | Pension plan
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	0	0
Level 1 | Pension plan | Investment in separate accounts fixed income
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	0	0
Level 1 | Pension plan | Investment in separate accounts equity
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	0	0
Level 2 | Pension plan
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	18,704	17,459
Level 2 | Pension plan | Investment in separate accounts fixed income
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	14,406	13,638
Level 2 | Pension plan | Investment in separate accounts equity
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	4,298	3,821
Level 3 | Pension plan
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	0	0
Level 3 | Pension plan | Investment in separate accounts fixed income
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	0	0
Level 3 | Pension plan | Investment in separate accounts equity
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	$ 0	$ 0