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Investment Securities-Unrealized Gain (Loss) on Investments (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Mar. 31, 2020
--- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Held-to-maturity, Total | $ 9,164 | $ 10,151
Held-to-maturity, Gross Unrealized Gains | 387 | 418
Held-to-maturity, Gross Unrealized Losses | 0 | 5
Held-to-maturity, Fair Value | 9,551 | 10,564
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale, Amortized Cost | 99,814 | 64,897
Available-for-sale, Gross Unrealized Gains | 725 | 1,115
Available-for-sale, Gross Unrealized Losses | 358 | 183
Available-for-sale, Fair Value | 100,181 | 65,829
Government National Mortgage Association (GNMA) |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Held-to-maturity, Total | 736 | 972
Held-to-maturity, Gross Unrealized Gains | 69 | 76
Held-to-maturity, Gross Unrealized Losses | 0 | 0
Held-to-maturity, Fair Value | 805 | 1,048
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale, Amortized Cost | 1,223 | 3,510
Available-for-sale, Gross Unrealized Gains | 47 | 77
Available-for-sale, Gross Unrealized Losses | 0 | 0
Available-for-sale, Fair Value | 1,270 | 3,587
Federal Home Loan Mortgage Corporation (FHLMC) |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale, Amortized Cost | 29,259 | 9,244
Available-for-sale, Gross Unrealized Gains | 93 | 312
Available-for-sale, Gross Unrealized Losses | 183 | 18
Available-for-sale, Fair Value | 29,169 | 9,538
Federal National Mortgage Association (FNMA) |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Held-to-maturity, Total | 7,428 | 8,179
Held-to-maturity, Gross Unrealized Gains | 318 | 342
Held-to-maturity, Gross Unrealized Losses | 0 | 0
Held-to-maturity, Fair Value | 7,746 | 8,521
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale, Amortized Cost | 15,379 | 21,495
Available-for-sale, Gross Unrealized Gains | 1 | 673
Available-for-sale, Gross Unrealized Losses | 0 | 0
Available-for-sale, Fair Value | 15,380 | 22,168
Mortgage-backed securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Held-to-maturity, Total | 8,164 | 9,151
Held-to-maturity, Gross Unrealized Gains | 387 | 418
Held-to-maturity, Gross Unrealized Losses | 0 | 0
Held-to-maturity, Fair Value | 8,551 | 9,569
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale, Amortized Cost | 45,861 | 34,249
Available-for-sale, Gross Unrealized Gains | 141 | 1,062
Available-for-sale, Gross Unrealized Losses | 183 | 18
Available-for-sale, Fair Value | 45,819 | 35,293
US Government Agency Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale, Amortized Cost | 19,816 | 26,616
Available-for-sale, Gross Unrealized Gains | 0 | 20
Available-for-sale, Gross Unrealized Losses | 138 | 155
Available-for-sale, Fair Value | 19,678 | 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 | 0 | 5
Held-to-maturity, Fair Value | 1,000 | 995
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale, Amortized Cost | 5,275 | 4,032
Available-for-sale, Gross Unrealized Gains | 78 | 33
Available-for-sale, Gross Unrealized Losses | 0 | 10
Available-for-sale, Fair Value | 5,353 | $ 4,055
Municipal Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale, Amortized Cost | 17,769 |
Available-for-sale, Gross Unrealized Gains | 119 |
Available-for-sale, Gross Unrealized Losses | 11 |
Available-for-sale, Fair Value | 17,877 |
Asset-backed Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale, Amortized Cost | 11,093 |
Available-for-sale, Gross Unrealized Gains | 387 |
Available-for-sale, Gross Unrealized Losses | 26 |
Available-for-sale, Fair Value | $ 11,454 |

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