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Investment Securities-Schedule of Unrealized Loss (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Mar. 31, 2021
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Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 1,237 | $ 3,217
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 39,836 | 60,110
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 597 | 113
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 33,883 | 18,631
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 1,834 | 3,330
Debt Securities, Available-for-sale, Unrealized Loss Position | 73,719 | 78,741
Mortgage-backed securities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 531 | 1,271
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 20,208 | 39,020
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 536 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 16,479 | 0
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 1,067 | 1,271
Debt Securities, Available-for-sale, Unrealized Loss Position | 36,687 | 39,020
US Government Agency Securities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 0 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 61 | 113
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 17,404 | 18,631
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 61 | 113
Debt Securities, Available-for-sale, Unrealized Loss Position | 17,404 | 18,631
Corporate Bonds |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 338 | 793
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 4,935 | 4,481
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 0 | 0
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 338 | 793
Debt Securities, Available-for-sale, Unrealized Loss Position | 4,935 | 4,481
Municipal Securities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 368 | 1,153
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 14,693 | 16,609
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 0 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 368 | 1,153
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 14,693 | $ 16,609

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