Loan Receivable and Allowance for Loan and Lease Losses Non-performing loans (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Mar. 31, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Held-for-sale, Fair Value Disclosure	$ 2,404	$ 2,576
Other Real Estate, Foreclosed Assets, and Repossessed Assets	960	4,341
Financing Receivable, Recorded Investment, Nonaccrual Status	10,147	8,395
Impaired and non performing TDR loans		3,600
One- to four family loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	2,997	3,664
Multifamily Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	1,229	1,053
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	3,427	2,817
Business [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	$ 2,494	$ 861