Fair Value Measurements Fair Value on a Recurring basis (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Mar. 31, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Mortgage servicing rights	$ 205	$ 210
Government National Mortgage Asscociation, AFS, Fair Value Disclosure	5,182	5,527
Federal Home Loan Mortgage Corp., AFS, Fair Value Disclosure	8,271	10,588
Federal National Mortgage Corporation, AFS, Fair Value Disclosure	8,372	10,857
Other	46	47
US Government Agency securities	43,140	57,850
Other Securities, AFS, Fair Value Disclosure	10,749	16,316
Available-for-sale	75,760	101,185
Assets, Fair Value Disclosure	75,965	101,395
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Mortgage servicing rights	0	0
Government National Mortgage Asscociation, AFS, Fair Value Disclosure	0	0
Federal Home Loan Mortgage Corp., AFS, Fair Value Disclosure	0	0
Federal National Mortgage Corporation, AFS, Fair Value Disclosure	$ 0	0
Other		0
US Government Agency securities	$ 0	0
Other Securities, AFS, Fair Value Disclosure	0	0
Available-for-sale	0	0
Assets, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Mortgage servicing rights	0	0
Government National Mortgage Asscociation, AFS, Fair Value Disclosure	5,182	5,527
Federal Home Loan Mortgage Corp., AFS, Fair Value Disclosure	8,271	10,588
Federal National Mortgage Corporation, AFS, Fair Value Disclosure	8,372	10,857
Other	0	0
US Government Agency securities	43,140	57,850
Other Securities, AFS, Fair Value Disclosure	10,749	16,316
Available-for-sale	75,714	101,138
Assets, Fair Value Disclosure	75,714	101,138
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Mortgage servicing rights	205	210
Government National Mortgage Asscociation, AFS, Fair Value Disclosure	0	0
Federal Home Loan Mortgage Corp., AFS, Fair Value Disclosure	0	0
Federal National Mortgage Corporation, AFS, Fair Value Disclosure	0	0
Other	46	47
US Government Agency securities	0	0
Other Securities, AFS, Fair Value Disclosure	0	0
Available-for-sale	46	47
Assets, Fair Value Disclosure	$ 251	$ 257