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Investment Securities-Classified by Contractual Maturity Date (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Mar. 31, 2018
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Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity |  |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost | $ 1,005 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost | 8,279 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost | 17,775 |
Debt Securities, Available-for-sale, Allocated and Single Maturity Date, Maturity, after 10 Years, Amortized Cost | 53,725 |
Debt Securities, Available-for-sale, Amortized Cost | 80,784 |
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity |  |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value | 998 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value | 8,116 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value | 17,590 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value | 53,141 |
Debt Securities, Available-for-sale | $ 79,845 |
Debt Securities, Available-for-sale, Maturity, Weighted Average Yield [Abstract] |  |
Available-for-sale, Securities, Debt Maturities, within One Year, Weighted Average Rate | 1.65% |
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Weighted Average Yield | 1.72% |
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Weighted Average Yield | 2.84% |
Available-for-sale Securities, Debt Maturities, after Ten Years, Weighted Average Yield | 2.76% |
Available-for-sale Securities, Debt Maturities, Weighted Average Yield | 2.65% |
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount |  |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost | $ 4,555 |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost | 4,381 |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after 10 Years, Amortized Cost | 2,201 |
Debt Securities, Held-to-maturity | 11,137 | $ 12,075
Held-to-maturity Securities, Debt Maturities, Fair Value, Fiscal Year Maturity |  |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value | 4,530 |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value | 4,377 |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value | 2,200 |
Debt Securities, Held-to-maturity, Fair Value | $ 11,107 | $ 11,909
Debt Securities, Held-to-maturity, Maturity, Weighted Average Yield [Abstract] |  |
Debt Securities, Held-to-maturity, Maturity, after One Through Five Years, Weighted Average Yield | 2.40% |
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Weighted Average Yield | 3.31% |
Held-to-maturity Securities, Debt Maturities, after Ten Years, Weighted Average Yield | 2.87% |
Held-to-maturity Securities, Debt Maturities, Weighted Average Yield | 2.85% |

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- Definition Fair value of investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 + Details
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