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Investment Securities-Classified by Contractual Maturity Date (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Mar. 31, 2017
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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, after One Through Five Years, Amortized Cost | $ 10,317 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost | 10,460 |
Debt Securities, Available-for-sale, Allocated and Single Maturity Date, Maturity, after 10 Years, Amortized Cost | 32,225 |
Debt Securities, Available-for-sale, Amortized Cost | 53,002 |
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity |  |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value | 9,974 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value | 9,975 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value | 30,976 |
Debt Securities, Available-for-sale | $ 50,925 |
Debt Securities, Available-for-sale, Maturity, Weighted Average Yield [Abstract] |  |
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Weighted Average Yield | 1.68% |
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Weighted Average Yield | 2.08% |
Available-for-sale Securities, Debt Maturities, after Ten Years, Weighted Average Yield | 2.35% |
Available-for-sale Securities, Debt Maturities, Weighted Average Yield | 2.17% |
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 | $ 2,776 |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost | 6,151 |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after 10 Years, Amortized Cost | 3,148 |
Debt Securities, Held-to-maturity | 12,075 | $ 13,435
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 | 2,719 |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value | 6,077 |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value | 3,113 |
Debt Securities, Held-to-maturity, Fair Value | $ 11,909 | $ 13,497
Debt Securities, Held-to-maturity, Maturity, Weighted Average Yield [Abstract] |  |
Debt Securities, Held-to-maturity, Maturity, after One Through Five Years, Weighted Average Yield | 2.41% |
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Weighted Average Yield | 3.03% |
Held-to-maturity Securities, Debt Maturities, after Ten Years, Weighted Average Yield | 2.61% |
Held-to-maturity Securities, Debt Maturities, Weighted Average Yield | 2.78% |

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