Other Comprehensive Income (Loss) Components of Accumulated Other Comprehensive Income (Loss) (Details) (USD $)	3 Months Ended	12 Months Ended
	Dec. 31, 2013	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Other Comprehensive Income (Loss) [Abstract]
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax		$ (4,768,000)	$ 1,064,000
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net		(5,800,000)	700,000
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax		0	(501,000)
Pension plan adjustment	(432,000)	(716,000)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Reclassification Adjustments, Net		1,217,000	500,000
Accumulated Other Comprehensive Income (Loss), Net		(4,768,000)	563,000
Other Comprehensive (Loss) Income, Net of Tax		$ (4,615,000)	$ 404,000	$ 478,000