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Investment Securities Unrealized losses and fair value of securities (Details) (USD $) In Thousands, unless otherwise specified | 6 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2013 | Mar. 31, 2013
Gain (Loss) on Investments [Line Items] |  |
Unrealized Loss on Securities | $ (5,153) | $ (290)
Total securities Estimated Fair Value | 99,764 | 125,680
Total mortgage-backed securities AFS |  |
Gain (Loss) on Investments [Line Items] |  |
AFS unrealized losses less than 12 months | (1,066) | (104)
AFS Fair Value less than 12 months | 29,132 | 10,298
AFS unrealized losses 12 months of longer | 0 | 0
AFS Fair Value 12 months or longer | 0 | 0
AFS total unrealized losses | (1,066) | (104)
Total Fair Value AFS | 29,132 | 10,298
Held-to-maturity Securities, unrealized losses, less than 12 months | (277) |
Held-to-maturity Securities fair value, Less than Twelve Months | 4,851 |
Held-to-maturity Securities, Unrealized Losses, 12 Months or Longer | 0 |
Held-to-maturity Securities, fair value, Twelve Months or Longer | 0 |
Held-to-maturity Securities,total unrealized Losses | (277) |
Total fair value Held-to-maturity Securities | 4,851 |
US Government Agency Securities |  |
Gain (Loss) on Investments [Line Items] |  |
AFS unrealized losses less than 12 months | (3,291) | (177)
AFS Fair Value less than 12 months | 45,200 | 25,290
AFS unrealized losses 12 months of longer | (140) | 0
AFS Fair Value 12 months or longer | 1,859 | 0
AFS total unrealized losses | (3,431) | (177)
Total Fair Value AFS | 47,059 | 25,290
Other |  |
Gain (Loss) on Investments [Line Items] |  |
AFS unrealized losses less than 12 months | (379) | (9)
AFS Fair Value less than 12 months | 9,621 | 9,991
AFS unrealized losses 12 months of longer | 0 | 0
AFS Fair Value 12 months or longer | 0 | 0
AFS total unrealized losses | (379) | (9)
Total Fair Value AFS | 9,621 | 9,991
Total available-for-sale securities [Member] |  |
Gain (Loss) on Investments [Line Items] |  |
AFS unrealized losses less than 12 months | (4,736) | (290)
AFS Fair Value less than 12 months | 83,953 | 45,579
AFS unrealized losses 12 months of longer | (140) | 0
AFS Fair Value 12 months or longer | 1,859 | 0
AFS total unrealized losses | (4,876) | (290)
Total Fair Value AFS | 85,812 | 45,579
Total held-to-maturity Securities [Member] |  |
Gain (Loss) on Investments [Line Items] |  |
Held-to-maturity Securities, unrealized losses, less than 12 months | (277) |
Held-to-maturity Securities fair value, Less than Twelve Months | 4,851 |
Held-to-maturity Securities, Unrealized Losses, 12 Months or Longer | 0 |
Held-to-maturity Securities, fair value, Twelve Months or Longer | 0 |
Held-to-maturity Securities,total unrealized Losses | (277) |
Total fair value Held-to-maturity Securities | 4,851 |
Total securities [Member] |  |
Gain (Loss) on Investments [Line Items] |  |
Total Securities unrealized Loss Position Less than 12 months | (5,013) |
Total Securities Unrealized Loss Position Less than 12 months Fair Value | 88,804 |
Total Securities, Unrealized Loss Position ,12 months or Longer | (140) |
Total Securities, Unrealized Loss Position, 12 months or Longer, Fair Value | 1,859 |
Unrealized Loss on Securities | (5,153) |
Total securities Estimated Fair Value | $ 90,663 |

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