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Investment Securities Investment Securities Unrealized losses and fair value of securities (Details) (USD $) In Thousands, unless otherwise specified | 6 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2014 | Mar. 31, 2014
Schedule of Investments [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | $ (7) | $ (2,437)
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 2,649 | 51,174
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss | (3,069) | (2,335)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 80,396 | 38,238
Available-for-sale Securities, Gross Unrealized Loss | (3,076) | (4,772)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 83,045 | 89,412
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | 0 | (283)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 0 | 4,796
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss | (144) | 0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 4,887 | 0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Loss | (144) | (283)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value | 4,887 | 4,796
Securities Continuous Loss Position Less than 12 months | (7) | (2,720)
Securities Continuous Unrealized Loss Position Less than 12 months Fair Value | 2,649 | 55,970
Securities, Continuous Unrealized Loss Position ,12 months or Longer | (3,213) | (2,335)
Securities, Continuous Unrealized Loss Position, 12 months or Longer, Fair Value | 85,283 | 38,238
Unrealized Loss on Securities | (3,220) | (5,055)
Securities, Continuous Unrealized Loss Position, fair value | 87,932 | 94,208
Mortgage-backed securities |  |
Schedule of Investments [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | (4) | (322)
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 652 | 7,569
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss | (788) | (1,015)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 24,940 | 20,123
Available-for-sale Securities, Gross Unrealized Loss | (792) | (1,337)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 25,592 | 27,692
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | 0 | (283)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 0 | 4,796
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss | (144) | 0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 4,887 | 0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Loss | (144) | (283)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value | 4,887 | 4,796
US Government Agency Securities |  |
Schedule of Investments [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | (3) | (1,646)
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 1,997 | 34,074
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss | (1,911) | (1,320)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 45,826 | 18,115
Available-for-sale Securities, Gross Unrealized Loss | (1,914) | (2,966)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 47,823 | 52,189
Other |  |
Schedule of Investments [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | 0 | (469)
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 0 | 9,531
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss | (370) | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 9,630 | 0
Available-for-sale Securities, Gross Unrealized Loss | (370) | (469)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | $ 9,630 | $ 9,531

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