Employee Benefit Plans (Schedule of Net Period Benefit Cost and Other Amounts Recognized in Other Comprehensive Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Supplemental Executive Retirement Plan [Member]
Net period benefit cost
Service cost	$ 307	$ 270	$ 326
Interest cost	424	456	377
Recognized net actuarial loss	218	140	224
Amortization of prior service cost (credit)	19	19	19
Net period benefit cost	968	885	946
Changes in funded status recognized in other comprehensive loss, before taxes
Net actuarial (gain) loss	(32)	777	(579)
Amortization of net unrecognized actuarial loss	(218)	(140)	(224)
Amortization of prior service (cost) credit	(19)	(19)	(19)
Total recognized in OCI, before taxes	(269)	618	(822)
Total recognized in net period benefit cost and OCI, before taxes	699	1,503	124
Other Postretirement Benefit Plan [Member]
Net period benefit cost
Service cost	62	45	42
Interest cost	117	132	173
Recognized net actuarial loss	24	10	48
Amortization of prior service cost (credit)	(22)	(22)	(23)
Net period benefit cost	181	165	240
Changes in funded status recognized in other comprehensive loss, before taxes
Net actuarial (gain) loss	92	(134)	(538)
Amortization of net unrecognized actuarial loss	(24)	(10)	(48)
Amortization of prior service (cost) credit	22	22	23
Total recognized in OCI, before taxes	90	(122)	(563)
Total recognized in net period benefit cost and OCI, before taxes	$ 271	$ 43	$ (323)