Employee Benefit Plans Fair Values of Plan Investments by Hierarchy Level (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 16,631	$ 15,717	$ 17,300
Interest bearing deposits in banks [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		131
U.S. Government [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,826	341
Common trust funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5,207
Corporate bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		4,569
Mutual and exchange traded funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,798	573
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	14,805	13,020
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | U.S. Government [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		341
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Common trust funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5,207
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Corporate bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		2,003
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Mutual and exchange traded funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,798	573
Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,826	2,697
Significant Other Observable Inputs (Level 2) [Member] | Interest bearing deposits in banks [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		131
Significant Other Observable Inputs (Level 2) [Member] | U.S. Government [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,826
Significant Other Observable Inputs (Level 2) [Member] | Corporate bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		2,566
Information technology [Member] | Equity securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	976	1,544
Information technology [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	976	1,544
Financial [Member] | Equity securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	813	1,368
Financial [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	813	1,368
Industrials [Member] | Equity securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,212	945
Industrials [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,212	945
Healthcare [Member] | Equity securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,393	1,746
Healthcare [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,393	1,746
Consumer [Member] | Equity securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,131	3,346
Consumer [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,131	3,346
Energy [Member] | Equity securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,275	1,154
Energy [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 1,275	$ 1,154