Investment Securities Unrealized losses and fair value of securities (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	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