Summary of Financing Arrangements for Leveraged ESOP Debt (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Issued June, 1991
Debt Disclosure [Abstract]
Employee stock ownership plan (ESOP), debt structure, indirect loan, amount	$ 2,169
Employee stock ownership plan (ESOP), interest payments	250	299	386
Issued March, 1999
Debt Disclosure [Abstract]
Employee stock ownership plan (ESOP), debt structure, indirect loan, amount	0
Employee stock ownership plan (ESOP), interest payments	0	0	0
Issued February, 2000
Debt Disclosure [Abstract]
Employee stock ownership plan (ESOP), debt structure, indirect loan, amount	0
Employee stock ownership plan (ESOP), interest payments	0	0	6
Issued April, 2001
Debt Disclosure [Abstract]
Employee stock ownership plan (ESOP), debt structure, indirect loan, amount	0
Employee stock ownership plan (ESOP), interest payments	0	5	9
Issued July, 2009
Debt Disclosure [Abstract]
Employee stock ownership plan (ESOP), debt structure, indirect loan, amount	632
Employee stock ownership plan (ESOP), interest payments	$ 35	$ 15	$ 5