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Investment Securities Investment Securities-Schedule of Unrealized Loss (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Mar. 31, 2020
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Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 219 | $ 10
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 30,751 | 1,999
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 139 | 173
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 20,104 | 22,113
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 358 | 183
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 50,855 | 24,112
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 5
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value |  | 995
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value |  | 0
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss |  | 5
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value |  | 995
Mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 182 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 25,356 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 1 | 18
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 426 | 619
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 183 | 18
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 25,782 | 619
US Government Agency Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 0 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 138 | 155
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 19,678 | 21,494
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 138 | 155
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 19,678 | 21,494
Municipal Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 11 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 2,914 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 0 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 11 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 2,914 |
Corporate Bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 10
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 0 | 1,999
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 0 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 0 | 10
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 0 | 1,999
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 5
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value |  | 995
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value |  | 0
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss |  | 5
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value |  | $ 995
Asset-backed Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 26 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 2,481 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 0 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 26 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | $ 2,481 |

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