Employee Benefit Plans (Schedule of Net Period Benefit Cost and Other Amounts Recognized in Other Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Supplemental Executive Retirement Plan [Member]
Net period benefit cost
Service cost	$ 270	$ 326	$ 269
Interest cost	456	377	408
Recognized net actuarial loss	140	224	114
Amortization of prior service cost (credit)	19	19	19
Net period benefit cost	885	946	810
Changes in funded status recognized in other comprehensive loss, before taxes
Net actuarial (gain) loss	777	(579)	1,334
Amortization of net unrecognized actuarial loss	(140)	(224)	(114)
Amortization of prior service (cost) credit	(19)	(19)	(19)
Total recognized in OCI, before taxes	618	(822)	1,201
Total recognized in net period benefit cost and OCI, before taxes	1,503	124	2,011
Other Postretirement Benefit Plan [Member]
Net period benefit cost
Service cost	45	42	70
Interest cost	132	173	148
Recognized net actuarial loss	10	48	31
Amortization of prior service cost (credit)	(22)	(23)
Net period benefit cost	165	240	249
Changes in funded status recognized in other comprehensive loss, before taxes
Net actuarial (gain) loss	(134)	(538)	275
Amortization of net unrecognized actuarial loss	(10)	(48)	(31)
Amortization of prior service (cost) credit	22	23
Total recognized in OCI, before taxes	(122)	(563)	244
Total recognized in net period benefit cost and OCI, before taxes	$ 43	$ (323)	$ 493