Employee Benefit Plans (Details 1) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Components of net pension cost
Pension expense - three months ended March 31, (actual)	$ 307	$ 348
Pension
Components of net pension cost
Service cost - benefits earned during the year				$ 1,325
Interest costs on projected benefit obligations				838
Expected return on plan assets				(957)
Expected administrative expenses				40
Amortization of prior service cost				79
Amortization of unrecognized net loss				66
Net periodic pension expense				1,391
Pension expense - three months ended March 31, (actual)				$ 348
Pension | Estimated
Components of net pension cost
Service cost - benefits earned during the year			$ 1,179
Interest costs on projected benefit obligations			956
Expected return on plan assets			(1,057)
Expected administrative expenses			70
Amortization of prior service cost			$ 79
Amortization of unrecognized net loss
Net periodic pension expense			$ 1,227
Pension expense - three months ended March 31, (actual)			$ 307