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Investment Securities Investment Securities-Schedule of Unealized Loss (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Mar. 31, 2018
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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 |  | $ 420 | $ 181
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | 54,023 | 11,368
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 2,271 | 2,545
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 38,172 | 48,907
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | 2,691 | 2,726
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  | 92,195 | 60,275
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  |  | 188
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value |  |  | 7,681
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  |  | 59
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value |  |  | 1,612
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss |  |  | 247
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value |  |  | 9,293
Mortgage-backed securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 166 | 101
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | 19,708 | 3,702
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 1,829 | 1,506
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 27,273 | 28,124
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | 1,995 | 1,607
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  | 46,981 | 31,826
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 229 | 188
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value |  | 5,486 | 7,681
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 132 | 59
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value |  | 3,315 | 1,612
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss |  | 361 | 247
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value |  | 8,801 | 9,293
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 |  | 176 | 80
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | 18,046 | 7,666
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 237 | 178
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 6,038 | 6,566
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | 413 | 258
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  | 24,084 | 14,232
US Treasury Securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 78 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | 16,269 |
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 |  | 78 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  | 16,269 |
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 |  | 205 | 212
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 4,861 | 4,866
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | 205 | 212
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  | $ 4,861 | 4,866
Other investments |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | [1] |  | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | [1] |  | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | [1] |  | 649
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | [1] |  | 9,351
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | [1] |  | 649
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | [1] |  | $ 9,351
[1] | (1) Primarily comprised of an investment in a CRA fund with 95% of its underlying investments consisting of government and agency-backed securities.

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