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Investment Securities Investment Securities-Schedule of Unealized Loss (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Mar. 31, 2019
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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 | $ 123 | $ 23
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 14,084 | 20,851
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 374 | 1,141
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 34,344 | 43,766
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 497 | 1,164
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 48,428 | 64,617
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | 0 | 0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 6 | 87
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 1,216 | 8,752
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss | 6 | 87
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value | 1,216 | 8,752
Mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 29 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 3,424 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 241 | 851
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 14,598 | 26,787
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 270 | 851
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 18,022 | 26,787
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | 0 | 0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 6 | 87
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 1,216 | 8,752
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss | 6 | 87
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value | 1,216 | 8,752
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 | 94 | 23
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 10,660 | 20,851
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 131 | 213
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 17,736 | 12,002
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 225 | 236
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 28,396 | 32,853
Corporate Bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 0 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 2 | 77
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 2,010 | 4,977
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 2 | 77
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | $ 2,010 | $ 4,977

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