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Investment Securities Carrying Value (Amortized Cost) and Fair Value by remaining period of contractual maturity (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2012 | Mar. 31, 2012
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Schedule of Available-for-sale Securities [Line Items] |  |
AFS Amortized Cost Less than one year | $ 3,103 |
AFS Amortized Cost One through five years | 9,898 |
AFS Amortized Cost Five through ten years | 30,615 |
AFS Amortized Cost After ten years | 70,174 |
AFS Amortized Cost Total | 113,790 |
AFS Fair Value Less than one year | 3,105 |
AFS Fair Value One through five years | 10,074 |
AFS Fair Value Five through ten years | 30,778 |
AFS Fair Value After ten years | 70,505 |
AFS Fair Value | 114,462 | 85,106
AFS Weighted Average Rate Less than one year | 0.39% |
AFS Weighted Average Rate One through five years | 1.53% |
AFS Weighted Average Rate Five through ten years | 1.58% |
Available-for-sale Securities, Debt Maturities, after Ten Years, Weighted Average Rate | 1.46% |
AFS Weighted Average Rate Total | 1.46% |
HTM Amortized Cost Five through ten years | 204 |
HTM Amortized Cost After ten years | 9,834 |
HTM Amortized Cost Total | 10,038 |
HTM Fair Value Five through ten years | 214 |
HTM Fair Value After ten years | 10,523 |
HTM Fair Value Total | $ 10,737 |
HTM Weighted Average Rate Five through ten years | 3.92% |
HTM Weighted Average Rate After ten years | 4.09% |
HTM Weighted Average Rate Total | 4.09% |

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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 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 2: 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=6379932&loc=d3e22054-111558 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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