Retirement Plans (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			9 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Employees' Pension Plan [Member]
Net Periodic Benefit Cost [Line Items]
Service Cost		$ 377	$ 367	$ 1,130	$ 1,101
Interest Cost		298	315	896	944
Expected Return on Plan Assets		(722)	(716)	(2,167)	(2,148)
Amortization of Prior Service (Credit) Cost		(11)	10	(33)	28
Amortization of Net Loss		86	311	258	935
Net Periodic Benefit Cost		28	287	84	860
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	32
Interest Cost		55	33	164	81
Expected Return on Plan Assets		0	0	0	0
Amortization of Prior Service (Credit) Cost		18	19	54	59
Amortization of Net Loss		23	38	68	114
Net Periodic Benefit Cost		96	95	286	286
Contributions to Retirement Benefits Plans		119	133	356	354
Estimated Future Contributions in the Current Fiscal Year	119
Post-Retirement Benefit Plans [Member]
Net Periodic Benefit Cost [Line Items]
Service Cost		52	51	158	153
Interest Cost		49	56	221	206
Expected Return on Plan Assets		0	0	0	0
Amortization of Prior Service (Credit) Cost		(29)	(28)	(86)	(86)
Amortization of Net Loss		7	41	20	124
Net Periodic Benefit Cost		79	120	313	397
Contributions to Retirement Benefits Plans		72	77	300	252
Estimated Future Contributions in the Current Fiscal Year	$ 72