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Investment Securities-Unrealized Gain (Loss) on Investments (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Mar. 31, 2020
--- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Held-to-maturity, Total | $ 9,501 | $ 10,151
Held-to-maturity, Gross Unrealized Gains | 425 | 418
Held-to-maturity, Gross Unrealized Losses | 9 | 5
Held-to-maturity, Fair Value | 9,917 | 10,564
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale, Amortized Cost | 103,054 | 64,897
Available-for-sale, Gross Unrealized Gains | 349 | 1,115
Available-for-sale, Gross Unrealized Losses | 328 | 183
Available-for-sale, Fair Value | 103,075 | 65,829
Government National Mortgage Association (GNMA) |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Held-to-maturity, Total | 815 | 972
Held-to-maturity, Gross Unrealized Gains | 71 | 76
Held-to-maturity, Gross Unrealized Losses | 0 | 0
Held-to-maturity, Fair Value | 886 | 1,048
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale, Amortized Cost | 1,628 | 3,510
Available-for-sale, Gross Unrealized Gains | 62 | 77
Available-for-sale, Gross Unrealized Losses | 0 | 0
Available-for-sale, Fair Value | 1,690 | 3,587
Federal Home Loan Mortgage Corporation (FHLMC) |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale, Amortized Cost | 30,136 | 9,244
Available-for-sale, Gross Unrealized Gains | 116 | 312
Available-for-sale, Gross Unrealized Losses | 1 | 18
Available-for-sale, Fair Value | 30,251 | 9,538
Federal National Mortgage Association (FNMA) |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Held-to-maturity, Total | 7,686 | 8,179
Held-to-maturity, Gross Unrealized Gains | 354 | 342
Held-to-maturity, Gross Unrealized Losses | 0 | 0
Held-to-maturity, Fair Value | 8,040 | 8,521
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale, Amortized Cost | 15,603 | 21,495
Available-for-sale, Gross Unrealized Gains | 0 | 673
Available-for-sale, Gross Unrealized Losses | 0 | 0
Available-for-sale, Fair Value | 15,603 | 22,168
Mortgage-backed securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Held-to-maturity, Total | 8,501 | 9,151
Held-to-maturity, Gross Unrealized Gains | 425 | 418
Held-to-maturity, Gross Unrealized Losses | 0 | 0
Held-to-maturity, Fair Value | 8,926 | 9,569
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale, Amortized Cost | 47,367 | 34,249
Available-for-sale, Gross Unrealized Gains | 178 | 1,062
Available-for-sale, Gross Unrealized Losses | 1 | 18
Available-for-sale, Fair Value | 47,544 | 35,293
US Government Agency Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale, Amortized Cost | 20,473 | 26,616
Available-for-sale, Gross Unrealized Gains | 0 | 20
Available-for-sale, Gross Unrealized Losses | 164 | 155
Available-for-sale, Fair Value | 20,309 | 26,481
Corporate Bonds |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Held-to-maturity, Total | 1,000 | 1,000
Held-to-maturity, Gross Unrealized Gains | 0 | 0
Held-to-maturity, Gross Unrealized Losses | 9 | 5
Held-to-maturity, Fair Value | 991 | 995
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale, Amortized Cost | 6,276 | 4,032
Available-for-sale, Gross Unrealized Gains | 1 | 33
Available-for-sale, Gross Unrealized Losses | 59 | 10
Available-for-sale, Fair Value | 6,218 | $ 4,055
Municipal Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale, Amortized Cost | 17,773 |
Available-for-sale, Gross Unrealized Gains | 14 |
Available-for-sale, Gross Unrealized Losses | 53 |
Available-for-sale, Fair Value | 17,734 |
Asset-backed Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale, Amortized Cost | 11,165 |
Available-for-sale, Gross Unrealized Gains | 156 |
Available-for-sale, Gross Unrealized Losses | 51 |
Available-for-sale, Fair Value | $ 11,270 |

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