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Investment Securities Investment Securities Unrealized losses and fair value of securities (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2015 | Mar. 31, 2015
Schedule of Investments [Line Items] |  |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | $ (3) | $ (57)
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | 4,997 | 12,943
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | (858) | (1,090)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 53,719 | 58,499
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | (861) | (1,147)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  | 58,716 | 71,442
Securities Continuous Loss Position Less than 12 months |  | (30) |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | (27) |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | 2,901 |
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 0 |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 0 |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | (27) |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value |  | 2,901 |
Securities Continuous Unrealized Loss Position Less than 12 months Fair Value |  | 7,898 |
Securities, Continuous Unrealized Loss Position ,12 months or Longer |  | (858) |
Securities, Continuous Unrealized Loss Position, 12 months or Longer, Fair Value |  | 53,719 |
Unrealized Loss on Securities |  | (888) | (1,147)
Securities, Continuous Unrealized Loss Position, fair value |  | 61,617 |
Mortgage-backed securities |  |  |
Schedule of Investments [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 |  | (209) | (287)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 17,836 | 22,297
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | (209) | (287)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  | 17,836 | 22,297
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | (27) |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | 2,901 |
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 0 |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 0 |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | (27) |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value |  | 2,901 |
US Government Agency Securities |  |  |
Schedule of Investments [Line Items] |  |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | (3) | (57)
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | 4,997 | 12,943
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | (415) | (605)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 26,117 | 26,400
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | (418) | (662)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  | 31,114 | 39,343
Other |  |  |
Schedule of Investments [Line Items] |  |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | [1] | 0 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | [1] | 0 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | [1] | (234) | (198)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | [1] | 9,766 | 9,802
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | [1] | (234) | (198)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | [1] | $ 9,766 | $ 9,802
[1] | (1) CRA fund comprised of over 95% agency securities.

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