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Investment Securities Unrealized losses and fair value of securities (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Mar. 31, 2014 | Mar. 31, 2013
Schedule of Investments [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | $ (2,437) | $ (290)
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 51,174 | 45,579
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss | (2,335) | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 38,238 | 0
Available-for-sale Securities, Gross Unrealized Loss | (4,772) | (290)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 89,412 | 45,579
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | (283) |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 4,796 |
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate 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, Aggregate Loss | (283) |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value | 4,796 |
Securities Continuous Loss Position Less than 12 months | (2,720) |
Securities Continuous Unrealized Loss Position Less than 12 months Fair Value | 55,970 |
Securities, Continuous Unrealized Loss Position ,12 months or Longer | (2,335) |
Securities, Continuous Unrealized Loss Position, 12 months or Longer, Fair Value | 38,238 |
Unrealized Loss on Securities | (5,055) | (290)
Securities, Continuous Unrealized Loss Position, Fair Value | 94,208 |
Mortgage-backed securities |  |
Schedule of Investments [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | (322) | (104)
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 7,569 | 10,298
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss | (1,015) | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 20,123 | 0
Available-for-sale Securities, Gross Unrealized Loss | (1,337) | (104)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 27,692 | 10,298
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | (283) |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 4,796 |
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate 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, Aggregate Loss | (283) |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value | 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 | (1,646) | (177)
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 34,074 | 25,290
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss | (1,320) | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 18,115 | 0
Available-for-sale Securities, Gross Unrealized Loss | (2,966) | (177)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 52,189 | 25,290
Other |  |
Schedule of Investments [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | (469) | (9)
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 9,531 | 9,991
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss | 0 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 0 | 0
Available-for-sale Securities, Gross Unrealized Loss | (469) | (9)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | $ 9,531 | $ 9,991

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