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Investment Securities Unrealized losses and fair value of securities (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2012 | Mar. 31, 2012
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Asset-backed Securities [Member] |  |
Gain (Loss) on Investments [Line Items] |  |
Total Fair Value AFS | $ 6,716 |
AFS Amortized Cost | 15,237 |
AFS unrealized losses less than 12 months | (21) |
AFS Fair Value less than 12 months | 6,716 |
AFS unrealized losses 12 months of longer | 0 |
AFS Fair Value 12 months or longer | 0 |
AFS Gross Unrealized Losses | (21) |
Total mortgage-backed securities AFS |  |
Gain (Loss) on Investments [Line Items] |  |
Total Fair Value AFS | 21,109 | 13,699
AFS Amortized Cost | 39,934 | 45,782
AFS unrealized losses less than 12 months | (188) | (25)
AFS Fair Value less than 12 months | 17,123 | 13,699
AFS unrealized losses 12 months of longer | (53) | 0
AFS Fair Value 12 months or longer | 3,986 | 0
AFS Gross Unrealized Losses | (241) | (25)
US Government Agency Securities |  |
Gain (Loss) on Investments [Line Items] |  |
Total Fair Value AFS | 11,044 | 9,917
AFS Amortized Cost | 43,128 | 23,176
AFS unrealized losses less than 12 months | (20) | (63)
AFS Fair Value less than 12 months | 11,044 | 9,917
AFS unrealized losses 12 months of longer | 0 | 0
AFS Fair Value 12 months or longer | 0 | 0
AFS Gross Unrealized Losses | (20) | (63)
Treasuries |  |
Gain (Loss) on Investments [Line Items] |  |
Total Fair Value AFS | 1,552 | 1,555
AFS unrealized losses less than 12 months | 0 | (1)
AFS Fair Value less than 12 months | 1,552 | 1,555
AFS unrealized losses 12 months of longer | 0 | 0
AFS Fair Value 12 months or longer | 0 | 0
AFS Gross Unrealized Losses | 0 | (1)
Other |  |
Gain (Loss) on Investments [Line Items] |  |
Total Fair Value AFS |  | 9,973
AFS Amortized Cost | 10,485 | 10,536
AFS unrealized losses less than 12 months |  | (27)
AFS Fair Value less than 12 months |  | 9,973
AFS unrealized losses 12 months of longer |  | 0
AFS Fair Value 12 months or longer |  | 0
AFS Gross Unrealized Losses | 0 | (27)
Debt Securities [Member] |  |
Gain (Loss) on Investments [Line Items] |  |
Total Fair Value AFS | 40,421 | 35,144
AFS unrealized losses less than 12 months | (229) | (116)
AFS Fair Value less than 12 months | 36,435 | 35,144
AFS unrealized losses 12 months of longer | (53) | 0
AFS Fair Value 12 months or longer | 3,986 | 0
AFS Gross Unrealized Losses | $ (282) | $ (116)

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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 7 -Footnote 2 -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 Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 19 -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 -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition This item represents the excess of amortized cost basis over fair value of securities that have been in a loss position for twelve months or longer for those securities which are categorized neither as held-to-maturity nor trading securities. + References No definition available. + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 03-1 -Paragraph 21 -Subparagraph a(2) -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 FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 17 -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563 + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 03-1 -Paragraph 21 -Subparagraph a(2) -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 FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 17 -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563 + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 03-1 -Paragraph 21 -Subparagraph a(2) -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 FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 17 -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563 + Details
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