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Loan Receivable and Allowance for Loan and Lease Losses Past due financing receivable (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Mar. 31, 2015
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Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, Recorded Investment, Past Due | $ 11,438 | $ 8,838
Financing Receivable, Recorded Investment, Current | 590,138 | 474,355
Loans Receivable, Net | 601,576 | 483,193
One- to four family loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, Recorded Investment, Past Due | 3,028 | 4,038
Financing Receivable, Recorded Investment, Current | 142,952 | 122,489
Loans Receivable, Net | 145,980 | 126,527
Multifamily Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, Recorded Investment, Past Due | 2,198 | 1,488
Financing Receivable, Recorded Investment, Current | 103,986 | 93,218
Loans Receivable, Net | 106,184 | 94,706
Commercial Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, Recorded Investment, Past Due | 3,427 | 3,188
Financing Receivable, Recorded Investment, Current | 264,021 | 182,663
Loans Receivable, Net | 267,448 | 185,851
Construction Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, Recorded Investment, Past Due | 0 | 0
Financing Receivable, Recorded Investment, Current | 5,012 | 5,076
Loans Receivable, Net | 5,012 | 5,076
Business [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, Recorded Investment, Past Due | 2,782 | 123
Financing Receivable, Recorded Investment, Current | 74,085 | 70,476
Loans Receivable, Net | 76,867 | 70,599
Consumer Loan [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, Recorded Investment, Past Due | 3 | 1
Financing Receivable, Recorded Investment, Current | 82 | 433
Loans Receivable, Net | 85 | 434
Financing Receivables, 30 to 59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, Recorded Investment, Past Due | 5,039 | 1,614
Financing Receivables, 30 to 59 Days Past Due [Member] | One- to four family loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, Recorded Investment, Past Due | 0 | 464
Financing Receivables, 30 to 59 Days Past Due [Member] | Multifamily Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, Recorded Investment, Past Due | 969 | 0
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, Recorded Investment, Past Due | 3,427 | 1,150
Financing Receivables, 30 to 59 Days Past Due [Member] | Construction Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, Recorded Investment, Past Due | 0 | 0
Financing Receivables, 30 to 59 Days Past Due [Member] | Business [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, Recorded Investment, Past Due | 640 | 0
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer Loan [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, Recorded Investment, Past Due | 3 | 0
Financing Receivables, 60 to 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, Recorded Investment, Past Due | 1,050 | 1,371
Financing Receivables, 60 to 89 Days Past Due [Member] | One- to four family loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, Recorded Investment, Past Due | 291 | 0
Financing Receivables, 60 to 89 Days Past Due [Member] | Multifamily Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, Recorded Investment, Past Due | 422 | 434
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, Recorded Investment, Past Due | 0 | 936
Financing Receivables, 60 to 89 Days Past Due [Member] | Construction Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, Recorded Investment, Past Due | 0 | 0
Financing Receivables, 60 to 89 Days Past Due [Member] | Business [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, Recorded Investment, Past Due | 337 | 0
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer Loan [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, Recorded Investment, Past Due | 0 | 1
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, Recorded Investment, Past Due | 5,349 | 5,853
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | One- to four family loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, Recorded Investment, Past Due | 2,737 | 3,574
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Multifamily Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, Recorded Investment, Past Due | 807 | 1,054
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, Recorded Investment, Past Due | 0 | 1,102
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Construction Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, Recorded Investment, Past Due | 0 | 0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Business [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, Recorded Investment, Past Due | 1,805 | 123
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Loan [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, Recorded Investment, Past Due | $ 0 | $ 0

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- Definition Financing receivables that are current. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953401-111524 + Details
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- Definition Recorded Investment in financing receivables that are past due at the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953401-111524 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes loans held for sale. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(a)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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