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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, 2013 | Mar. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due | $ 847 |  | $ 2,165 |
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due | 2,396 |  | 1,073 |
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due | 9,957 |  | 9,072 |
Financing Receivable, Recorded Investment, Past Due | 13,200 |  | 12,310 |
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down | 4,572 |  | 16,685 |
Performing TDR | 10,914 | [1] | 5,040 | [2]
Impaired Financing Receivable, Unpaid Principal Balance | 3611 | [3] | 4869 | [3]
Loans Receivable, Net | 366,744 |  | 331,218 |
Financing Receivable, Gross | 399,041 |  | 370,122 |
One- to four family loans [Member] |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due | 0 |  | 28 |
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due | 844 |  | 348 |
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due | 2,413 |  | 4,501 |
Financing Receivable, Recorded Investment, Past Due | 3,257 |  | 4,877 |
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down | 1,930 |  | 3,141 |
Performing TDR | 3,189 | [1] | 2,670 | [2]
Impaired Financing Receivable, Unpaid Principal Balance | 0 | [3] | 0 | [3]
Loans Receivable, Net | 113,072 |  | 63,299 |
Financing Receivable, Gross | 121,448 |  | 73,987 |
Multifamily Loans [Member] |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due | 142 |  | 1,142 |
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due | 1,285 |  | 238 |
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due | 758 |  | 423 |
Financing Receivable, Recorded Investment, Past Due | 2,185 |  | 1,803 |
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down | 0 |  | 0 |
Performing TDR | 616 | [1] | 616 | [2]
Impaired Financing Receivable, Unpaid Principal Balance | 0 | [3] | 0 | [3]
Loans Receivable, Net | 51,567 |  | 54,188 |
Financing Receivable, Gross | 54,368 |  | 56,607 |
Commercial Real Estate [Member] |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due | 696 |  | 846 |
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due | 202 |  | 220 |
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due | 5,700 |  | 2,671 |
Financing Receivable, Recorded Investment, Past Due | 6,598 |  | 3,737 |
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down | 1,811 |  | 9,097 |
Performing TDR | 3,898 | [1] | 1,290 | [2]
Impaired Financing Receivable, Unpaid Principal Balance | 2992 | [3] | 3020.00 | [3]
Loans Receivable, Net | 172,825 |  | 185,627 |
Financing Receivable, Gross | 188,124 |  | 202,771 |
Construction Loans [Member] |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due | 0 |  | 0 |
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due | 0 |  | 0 |
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due | 0 |  | 0 |
Financing Receivable, Recorded Investment, Past Due | 0 |  | 0 |
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down | 75 |  | 0 |
Performing TDR | 0 | [1] | 0 | [2]
Impaired Financing Receivable, Unpaid Principal Balance | 0 | [3] | 1230.00 | [3]
Loans Receivable, Net | 5,067 |  | 0 |
Financing Receivable, Gross | 5,142 |  | 1,230 |
Business [Member] |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due | 0 |  | 148 |
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due | 47 |  | 261 |
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due | 1,082 |  | 1,439 |
Financing Receivable, Recorded Investment, Past Due | 1,129 |  | 1,848 |
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down | 756 |  | 4,447 |
Performing TDR | 3,211 | [1] | 464 | [2]
Impaired Financing Receivable, Unpaid Principal Balance | 619 | [3] | 619.00 | [3]
Loans Receivable, Net | 24,016 |  | 27,899 |
Financing Receivable, Gross | 29,731 |  | 35,277 |
Consumer Loan [Member] |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due | 9 |  | 1 |
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due | 18 |  | 6 |
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due | 4 |  | 38 |
Financing Receivable, Recorded Investment, Past Due | 31 |  | 45 |
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down | 0 |  | 0 |
Performing TDR | 0 | [1] | 0 | [2]
Impaired Financing Receivable, Unpaid Principal Balance | 0 | [3] | 0 | [3]
Loans Receivable, Net | 197 |  | 205 |
Financing Receivable, Gross | $ 228 |  | $ 250 |
[1] | (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] | (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.
[3] | (2) Consists 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 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 Describes the policies and procedures for identifying and measuring losses on loans when the present value of expected cash flows discounted at the loan's effective interest rate, or, alternatively, a loan's observable market price or fair value of the underlying collateral is less than the carrying amount of the loan, and sets forth the amount of the loss. Also sets forth material facts pertaining to significant loan modifications in a troubled debt restructuring, describes the method for valuing a loan deemed to be impaired or nonperforming, indicates whether income on impaired or nonperforming loans are being recognized and describes the method for recognizing the income. + 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 (b) -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5212-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 35 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=16382521&loc=d3e2555-111518 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher OTS -Name Federal Regulation (FR) -Number Title 12 -Section 563c.102 -Paragraph 8 -Subparagraph j(ii) -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 114 -Paragraph 8, 11, 12, 13, 14, 15, 17, 20 -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 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 -Section 03 -Paragraph 7 -Subparagraph a -Article 9 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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- Definition Amount representing an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date. Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. Excludes amounts related to receivables held-for-sale. + 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 210.9-03.10(3)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 10 -Subparagraph 3 -Article 9 + Details
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