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Loan Receivable and Allowance for Loan and Lease Losses Past due financing receivable (Details) (USD $) In Thousands, unless otherwise specified | 6 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2012 | Mar. 31, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due | $ 4,242 |  | $ 21,030 |
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due | 2,753 |  | 1,382 |
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due | 9,459 |  |  |
Financing Receivable, Recorded Investment, Past Due | 16,454 |  | 53,876 |
impaired loans | 8,562 | [1] | 2,081 | [1]
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down | 16,932 | [2] |  |
Loans Receivable, Net | 338,002 |  | 335,859 |
Loans and Leases Receivable, Gross, Carrying Amount | 381,756 |  | 414,830 |
Loans and Leases Receivable, Net of Deferred Income | 379,950 |  | 412,858 |
One- to four family loans [Member] |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due | 0 |  | 2,381 |
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due | 589 |  | 0 |
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due | 3,170 |  | 4,681 |
Financing Receivable, Recorded Investment, Past Due | 3,759 |  | 7,062 |
impaired loans | 0 | [1] | 0 | [1]
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down | 2,924 | [2] | 2,306 | [3]
Loans Receivable, Net | 55,265 |  | 56,804 |
Loans and Leases Receivable, Gross, Carrying Amount | 61,948 |  | 66,172 |
Multifamily Loans [Member] |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due | 0 |  | 3,220 |
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due | 162 |  | 427 |
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due | 1,046 |  | 1,915 |
Financing Receivable, Recorded Investment, Past Due | 1,208 |  | 5,562 |
impaired loans | 0 | [1] | 0 | [1]
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down | 678 | [2] | 1,008 | [3]
Loans Receivable, Net | 71,629 |  | 72,414 |
Loans and Leases Receivable, Gross, Carrying Amount | 73,515 |  | 78,984 |
Commercial Real Estate Portfolio Segment [Member] |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due | 4,224 |  | 11,455 |
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due | 1,560 |  | 0 |
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due | 1,778 |  | 9,406 |
Financing Receivable, Recorded Investment, Past Due | 7,562 |  | 20,861 |
impaired loans | 3,618 | [1] | 2,000 | [1]
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down | 8,749 | [2] | 13,061 | [3]
Loans Receivable, Net | 179,712 |  | 170,099 |
Loans and Leases Receivable, Gross, Carrying Amount | 199,641 |  | 206,022 |
Construction Loans [Member] |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due | 0 |  | 0 |
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due | 0 |  | 0 |
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due | 0 |  | 11,086 |
Financing Receivable, Recorded Investment, Past Due | 0 |  | 11,086 |
impaired loans | 4,258 | [1] | 0 | [1]
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down | 0 | [2] | 239 | [3]
Loans Receivable, Net | 4,040 |  | 5,108 |
Loans and Leases Receivable, Gross, Carrying Amount | 8,298 |  | 16,433 |
Commercial Loan [Member] |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due | 0 |  | 3,937 |
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due | 420 |  | 954 |
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due | 3,450 |  | 4,353 |
Financing Receivable, Recorded Investment, Past Due | 3,870 |  | 9,244 |
impaired loans | 686 | [1] | 81 | [1]
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down | 4,581 | [2] | 4,428 | [3]
Loans Receivable, Net | 26,959 |  | 30,229 |
Loans and Leases Receivable, Gross, Carrying Amount | 36,096 |  | 43,982 |
Consumer Loan [Member] |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due | 18 |  | 37 |
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due | 22 |  | 1 |
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due | 15 |  | 23 |
Financing Receivable, Recorded Investment, Past Due | 55 |  | 61 |
impaired loans | 0 | [1] | 0 | [1]
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down | 0 | [2] | 0 | [3]
Loans Receivable, Net | 397 |  | 1,204 |
Loans and Leases Receivable, Gross, Carrying Amount | $ 452 |  | $ 1,265 |
[1] | (1) Consists of loans which are less than 90 days past due but impaired due to other risk characteristics.
[2] | (2) Excludes $5.2 million TDR loans that have performed in accordance with their modified terms for at least six months and are considered performing. These loans are classified as current.
[3] | (2) Excludes $3.5 million TDR loans that have performed in accordance with their modified terms for at least six months and are considered performing. These loans are classified as current.

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- Definition impaired loans + References No definition available. + Details
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- Definition Financing receivables that are less than 60 days past due but more than 29 days past due. + 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=6965416&loc=SL6953401-111524 + Details
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- Definition Financing receivables that are less than 90 days past due but more than 59 days past due. + 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=6965416&loc=SL6953401-111524 + Details
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- Definition Financing receivables that are equal to or greater than 90 days past due. + 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=6965416&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=6965416&loc=SL6953401-111524 + Details
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- Definition Reflects the amount of the write-down related to a troubled debt restructuring. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6951948&loc=d3e18845-111554 + Details
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- Definition Reflects the aggregate gross carrying amount of all categories of loans and leases held in portfolio, prior to deducting deferred income and the allowance for losses on loans and leases. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 01-6 -Paragraph 13 -Subparagraph e -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6375948&loc=d3e4428-111522 + Details
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- Definition Reflects the aggregate gross carrying amount of all categories of loans and leases held in portfolio, after deducting deferred income, but before deducting the allowance for losses on loans and leases. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6965416&loc=d3e5074-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6375948&loc=d3e4428-111522 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 01-6 -Paragraph 13 -Subparagraph e -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-DEP -Chapter 8 -Paragraph 116 -IssueDate 2006-05-01 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher OTS -Name Federal Regulation (FR) -Number Title 12 -Chapter V -Section 563c.102 -Paragraph 8 -Subparagraph e -Subsection I -LegacyDoc This is a non-GAAP reference that was included in the 2009 taxonomy. It will be removed from future versions of this taxonomy. + Details
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- Definition Total of loans held-for-sale and held-in-portfolio net of unearned income, allowance for loan and lease losses, if any, unamortized loan origination and other fees and costs, and purchased premiums or discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 9 -Section 03 -Paragraph 7 -Subparagraph a Reference 2: 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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