Benefit Plans (Details 3) (Split-Dollar Life Insurance Benefit Plan, USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Split-Dollar Life Insurance Benefit Plan
Amounts recognized in accumulated other comprehensive loss
Net actuarial loss	$ 591		$ 540
Prior transition obligation	1,485		1,507
Accumulated other comprehensive loss	2,076		2,047
Components of net periodic benefit cost:
Amortization of prior transition obligation	(12)	(26)
Interest cost	50	49
Net periodic benefit cost	$ 38	$ 23