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Loan and Lease Losses Past due financing receivable (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due | $ 1,073 |  | $ 21,030 |
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due | 2,165 |  | 1,382 |
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due | 9,072 |  | 31,464 |
Financing Receivable, Recorded Investment, Past Due | 12,310 |  | 53,876 |
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down | 21,700 |  | 21,042 |
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down | 16,685 |  |  |
Troubled Debt Restructuring, Debtor, Other | 5,040 | [1] | 3,461 | [1]
Financing Receivable, Recorded Investment, Current | 331,218 |  | 332,397 |
Loans Receivable, Net | 370,122 |  | 412,858 |
Loans and Leases Receivable, Gross, Carrying Amount | 371,135 |  | 414,830 |
Loans and Leases Receivable, Net of Deferred Income | 370,122 |  | 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 | 348 |  | 2,381 |
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due | 28 |  | 0 |
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due | 4,501 |  | 4,681 |
Financing Receivable, Recorded Investment, Past Due | 4,877 |  | 7,062 |
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down | 3,141 |  | 2,306 |
Impaired Financing Receivable, Unpaid Principal Balance | 0 | [2] | 0 | [2]
Troubled Debt Restructuring, Debtor, Other | 2,670 | [1] | 2,690 | [1]
Financing Receivable, Recorded Investment, Current | 63,299 |  | 54,114 |
Loans Receivable, Net | 73,987 |  | 66,172 |
Multifamily Loans [Member] |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due | 238 |  | 3,220 |
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due | 1,142 |  | 427 |
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due | 423 |  | 1,915 |
Financing Receivable, Recorded Investment, Past Due | 1,803 |  | 5,562 |
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down | 0 |  | 1,008 |
Impaired Financing Receivable, Unpaid Principal Balance | 0 | [2] | 0 | [2]
Troubled Debt Restructuring, Debtor, Other | 616 | [1] | 0 | [1]
Financing Receivable, Recorded Investment, Current | 54,188 |  | 72,414 |
Loans Receivable, Net | 56,607 |  | 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 | 220 |  | 11,455 |
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due | 846 |  | 0 |
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due | 2,671 |  | 9,406 |
Financing Receivable, Recorded Investment, Past Due | 3,737 |  | 20,861 |
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down | 9,097 |  | 13,061 |
Impaired Financing Receivable, Unpaid Principal Balance | 3,020 | [2] | 2,000 | [2]
Troubled Debt Restructuring, Debtor, Other | 1,290 | [1] | 430 | [1]
Financing Receivable, Recorded Investment, Current | 185,627 |  | 169,669 |
Loans Receivable, Net | 202,771 |  | 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 |
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down | 0 |  | 239 |
Impaired Financing Receivable, Unpaid Principal Balance | 1,230 | [2] | 0 | [2]
Troubled Debt Restructuring, Debtor, Other | 0 | [1] | 0 | [1]
Financing Receivable, Recorded Investment, Current | 0 |  | 5,108 |
Loans Receivable, Net | 1,230 |  | 16,433 |
Commercial Loan [Member] |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due | 261 |  | 3,937 |
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due | 148 |  | 954 |
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due | 1,439 |  | 4,353 |
Financing Receivable, Recorded Investment, Past Due | 1,848 |  | 9,244 |
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down | 4,447 |  | 4,428 |
Impaired Financing Receivable, Unpaid Principal Balance | 619 | [2] | 81 | [2]
Troubled Debt Restructuring, Debtor, Other | 464 | [1] | 341 | [1]
Financing Receivable, Recorded Investment, Current | 27,899 |  | 29,888 |
Loans Receivable, Net | 35,277 |  | 43,982 |
Consumer Loan [Member] |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due | 6 |  | 37 |
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due | 1 |  | 1 |
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due | 38 |  | 23 |
Financing Receivable, Recorded Investment, Past Due | 45 |  | 61 |
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down | 0 |  | 0 |
Impaired Financing Receivable, Unpaid Principal Balance | 0 | [2] | 0 | [2]
Troubled Debt Restructuring, Debtor, Other | 0 | [1] | 0 | [1]
Financing Receivable, Recorded Investment, Current | 205 |  | 1,204 |
Loans Receivable, Net | 250 |  | 1,265 |
Loans Receivable [Member] |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Impaired Financing Receivable, Unpaid Principal Balance | $ 4,869 | [2] | $ 2,081 | [2]
[1] | The performing TDR category details those loans that the Company has determined that the future collection of principal and interest is reasonably assured. This generally represents those borrowers who have performed according to the restructured terms for a period of at least six months.
[2] | onsists of loans which are less than 90 days past due but impaired due to other risk characteristics.

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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=7512638&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=7512638&loc=SL6953401-111524 + Details
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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=7512638&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=7512638&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=7512638&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 Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5212-111524 + Details
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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. 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 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6375948&loc=d3e4428-111522 Reference 2: 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. + Details
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- Definition Amount before allowance and after 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. 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 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=7512638&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 OTS -Name Federal Regulation (FR) -Number Title 12 -Section 563c.102 -Paragraph 8 -Subparagraph e -Chapter V -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. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-DEP -Paragraph 116 -IssueDate 2006-05-01 -Chapter 8 -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. + Details
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