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Investment Securities Carrying Value (Amortized Cost) and Fair Value by remaining period of contractual maturity (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Mar. 31, 2015
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Investments, Debt and Equity Securities [Abstract] |  |  |
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis | $ 4,999 |  |
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value | $ 4,991 |  |
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Weighted Average Rate | 1.52% |  |
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis | $ 12,122 |  |
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value | $ 12,108 |  |
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Weighted Average Rate | 2.06% |  |
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis | $ 39,365 |  |
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value | $ 39,081 |  |
Available-for-sale Securities, Debt Maturities, after Ten Years, Weighted Average Rate | 1.50% |  |
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis | $ 56,486 |  |
Available-for-sale Securities | $ 56,180 | $ 100,204 | [1],[2]
Available-for-sale Securities, Debt Maturities, Weighted Average Rate | 1.63% |  |
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount | $ 6,921 |  |
Held-to-maturity Securities, Debt Maturities, Year Six Through Ten, Fair Value | $ 7,089 |  |
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Weighted Average Rate | 3.02% |  |
Held-to-maturity Securities, Debt Maturities, after Ten Years, Net Carrying Amount | $ 8,390 |  |
Held-to-maturity Securities, Debt Maturities, after Ten Years, Fair Value | $ 8,564 |  |
Held-to-maturity Securities, Debt Maturities, after Ten Years, Weighted Average Rate | 2.53% |  |
Held-to-maturity Securities | $ 15,311 | 11,922 |
Held-to-maturity Securities, Fair Value | $ 15,653 | $ 12,231 |
Held-to-maturity Securities, Debt Maturities, Weighted Average Rate | 2.75% |  |
[1] | (1) March 31, 2015 and 2014 balances have been restated from previously reported results to correct for material and certain other errors from prior periods. Refer to Notes 1 and 18 for further detail.
[2] | (1) March 31, 2015 balances have been restated from previously reported results to correct for material and certain other errors from prior periods. Refer to Notes 1 and 18 for further detail.

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- Definition This item represents the cost of debt 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 Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 Reference 2: 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 Amount after adjustments of available-for-sale debt securities at cost, maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27198-111563 + Details
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- Definition Amount after adjustments of available-for-sale debt securities at cost, maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27198-111563 + Details
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- Definition Amount after adjustments of available-for-sale debt securities at cost, maturing after the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27198-111563 Reference 2: 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 Fair value of held-to-maturity debt securities maturing after the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f)(4) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 + Details
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