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Fair Value Measurements Fair Value on a Recurring basis (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Mar. 31, 2013 | Mar. 31, 2012
--- | --- | --- | ---
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Servicing Asset at Amortized Cost | $ 275 | $ 275 |
Government National Mortgage Asscociation, AFS, Fair Value Disclosure | 17,404 | 23,840 |
Federal Home Loan Mortgage Corp., AFS, Fair Value Disclosure | 17,372 | 16,059 |
Federal National Mortgage Corporation, AFS, Fair Value Disclosure | 11,193 | 4,303 |
Asset-Backed Securities, at Carrying Value | 12,766 | 15,519 |
Other Securities, AFS, Fair Value Disclosure | 57,642 | 56,330 |
AFS Fair Value | 116,377 | 116,051 |
Assets, Fair Value Disclosure | 116,652 | 116,326 |
Fair Value, Inputs, Level 1 [Member] |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Servicing Asset at Amortized Cost | 0 | 0 |
Government National Mortgage Asscociation, AFS, Fair Value Disclosure | 0 | 0 |
Federal Home Loan Mortgage Corp., AFS, Fair Value Disclosure | 0 | 0 |
Federal National Mortgage Corporation, AFS, Fair Value Disclosure | 0 | 0 |
Asset-Backed Securities, at Carrying Value | 0 | 0 |
Other Securities, AFS, Fair Value Disclosure | 0 | 0 |
AFS Fair Value | 0 | 0 |
Assets, Fair Value Disclosure | 0 | 0 |
Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Servicing Asset at Amortized Cost | 0 | 0 |
Government National Mortgage Asscociation, AFS, Fair Value Disclosure | 17,404 | 23,840 |
Federal Home Loan Mortgage Corp., AFS, Fair Value Disclosure | 17,372 | 16,059 |
Federal National Mortgage Corporation, AFS, Fair Value Disclosure | 11,193 | 4,303 |
Asset-Backed Securities, at Carrying Value | 12,766 | 15,519 |
Other Securities, AFS, Fair Value Disclosure | 57,592 | 56,279 |
AFS Fair Value | 116,327 | 116,000 | 116,000
Assets, Fair Value Disclosure | 116,327 | 116,000 |
Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Servicing Asset at Amortized Cost | 275 | 275 |
Government National Mortgage Asscociation, AFS, Fair Value Disclosure | 0 | 0 |
Federal Home Loan Mortgage Corp., AFS, Fair Value Disclosure | 0 | 0 |
Federal National Mortgage Corporation, AFS, Fair Value Disclosure | 0 | 0 |
Asset-Backed Securities, at Carrying Value | 0 | 0 |
Other Securities, AFS, Fair Value Disclosure | 50 | 51 |
AFS Fair Value | 50 | 51 | 51
Assets, Fair Value Disclosure | $ 325 | $ 326 |

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7534914&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph b -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 + Details
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- Definition The fair value as of the balance sheet date of firm holdings in mortgages, mortgage backed securities (investment instruments that represent ownership of an undivided interest in a group of mortgages, where principal and interest from the individual mortgages are used to pay investors' principal and interest on the mortgage backed security) and asset-backed securities that are primarily paid from the cash flows of a discrete pool of receivables or other financial assets (such as credit-card receivables), either fixed or revolving, that by their terms convert into cash within a finite time period. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6475986&loc=d3e42546-110969 + Details
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- Definition Amortized carrying amount (balance) as of the balance sheet date of an asset representing net future revenues from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7524895&loc=d3e120260-111741 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122492-111745 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122739-111746 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 140 -Paragraph 13A, 13B -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 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS140-4/FIN46(R)-8 -Paragraph B10 -Subparagraph a(1) -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 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 140 -Paragraph 17 -Subparagraph g(1)(a) -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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