Retirement Plans (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Net Periodic Benefit Cost [Line Items]
Contributions to Retirement Benefits Plans			$ (465)	$ (221)
Employees' Pension Plan [Member]
Net Periodic Benefit Cost [Line Items]
Service Cost	376	367	753	734
Interest Cost	268	276	598	629
Expected Return on Plan Assets	(723)	(716)	(1,445)	(1,432)
Amortization of Prior Service (Credit) Cost	(11)	9	(22)	18
Amortization of Net Loss	86	312	172	624
Net Periodic Benefit Cost	(4)	248	56	573
Contributions to Retirement Benefits Plans	0	0	0	0
Estimated Future Contributions in the Current Fiscal Year					0
Select Executive Retirement Plan [Member]
Net Periodic Benefit Cost [Line Items]
Service Cost	0	5	0	27
Interest Cost	48	10	109	48
Expected Return on Plan Assets	0	0	0	0
Amortization of Prior Service (Credit) Cost	18	20	36	40
Amortization of Net Loss	22	38	45	76
Net Periodic Benefit Cost	88	73	190	191
Contributions to Retirement Benefits Plans	118	110	237	221
Estimated Future Contributions in the Current Fiscal Year					237
Post-Retirement Benefit Plans [Member]
Net Periodic Benefit Cost [Line Items]
Service Cost	53	51	106	102
Interest Cost	62	69	172	150
Expected Return on Plan Assets	0	0	0	0
Amortization of Prior Service (Credit) Cost	(28)	(29)	(57)	(58)
Amortization of Net Loss	6	42	13	83
Net Periodic Benefit Cost	93	133	234	277
Contributions to Retirement Benefits Plans	86	94	228	175
Estimated Future Contributions in the Current Fiscal Year					$ 230