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Investment Securities Unrealized losses and fair value of securities (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2013 | Mar. 31, 2013
Gain (Loss) on Investments [Line Items] |  |
Unrealized Loss on Securities | $ (4,262) | $ (290)
Total securities Estimated Fair Value | 130,045 | 125,680
Total mortgage-backed securities AFS |  |
Gain (Loss) on Investments [Line Items] |  |
AFS unrealized losses less than 12 months | (958) | (104)
AFS Fair Value less than 12 months | 33,268 | 10,298
AFS unrealized losses 12 months of longer | 0 | 0
AFS Fair Value 12 months or longer | 0 | 0
AFS Gross Unrealized Losses | (958) | (104)
Total Fair Value AFS | 33,268 | 10,298
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | (303) |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 4,848 |
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 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 Losses | (303) |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value | 4,848 |
US Government Agency Securities |  |
Gain (Loss) on Investments [Line Items] |  |
AFS unrealized losses less than 12 months | (2,667) | (177)
AFS Fair Value less than 12 months | 48,038 | 25,290
AFS unrealized losses 12 months of longer | 0 | 0
AFS Fair Value 12 months or longer | 0 | 0
AFS Gross Unrealized Losses | (2,667) | (177)
Total Fair Value AFS | 48,038 | 25,290
Other |  |
Gain (Loss) on Investments [Line Items] |  |
AFS unrealized losses less than 12 months | (334) | (9)
AFS Fair Value less than 12 months | 9,666 | 9,991
AFS unrealized losses 12 months of longer | 0 | 0
AFS Fair Value 12 months or longer | 0 | 0
AFS Gross Unrealized Losses | (334) | (9)
Total Fair Value AFS | 9,666 | 9,991
Available-for-sale Securities [Member] |  |
Gain (Loss) on Investments [Line Items] |  |
AFS unrealized losses less than 12 months | (3,959) | (290)
AFS Fair Value less than 12 months | 90,972 | 45,579
AFS unrealized losses 12 months of longer | 0 | 0
AFS Fair Value 12 months or longer | 0 | 0
AFS Gross Unrealized Losses | (3,959) | (290)
Total Fair Value AFS | 90,972 | 45,579
Held-to-maturity Securities [Member] |  |
Gain (Loss) on Investments [Line Items] |  |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | (303) |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 4,848 |
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 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 Losses | (303) |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value | 4,848 |
Debt Securities [Member] |  |
Gain (Loss) on Investments [Line Items] |  |
Securities Continuous Loss Position Less than 12 months | (4,262) |
Securities Continuous Unrealized Loss Position Less than 12 months Fair Value | 95,820 |
Securities, Continuous Unrealized Loss Position ,12 months or Longer | 0 |
Securities, Continuous Unrealized Loss Position, 12 months or Longer, Fair Value | 0 |
Unrealized Loss on Securities | (4,262) |
Total securities Estimated Fair Value | $ 95,820 |

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