Investment Securities Unrealized losses and fair value of securities (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Dec. 31, 2013	Mar. 31, 2013
Gain (Loss) on Investments [Line Items]
Unrealized Loss on Securities	$ (6,797)	$ (290)
Total securities Estimated Fair Value	96,694	125,680
Total mortgage-backed securities AFS
Gain (Loss) on Investments [Line Items]
AFS unrealized losses less than 12 months	(1,082)	(104)
AFS Fair Value less than 12 months	20,773	10,298
AFS unrealized losses 12 months of longer	(531)	0
AFS Fair Value 12 months or longer	8,415	0
AFS total unrealized losses	(1,613)	(104)
Total Fair Value AFS	29,188	10,298
Held-to-maturity Securities, unrealized losses, less than 12 months	(361)
Held-to-maturity Securities fair value, Less than Twelve Months	4,742
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	(361)
Total fair value Held-to-maturity Securities	4,742
US Government Agency Securities
Gain (Loss) on Investments [Line Items]
AFS unrealized losses less than 12 months	(3,253)	(177)
AFS Fair Value less than 12 months	38,961	25,290
AFS unrealized losses 12 months of longer	(1,047)	0
AFS Fair Value 12 months or longer	6,926	0
AFS total unrealized losses	(4,300)	(177)
Total Fair Value AFS	45,887	25,290
CRA investment fund
Gain (Loss) on Investments [Line Items]
AFS unrealized losses less than 12 months	(523)	(9)
AFS Fair Value less than 12 months	9,477	9,991
AFS unrealized losses 12 months of longer	0	0
AFS Fair Value 12 months or longer	0	0
AFS total unrealized losses	(523)	(9)
Total Fair Value AFS	9,477	9,991
Total available-for-sale securities [Member]
Gain (Loss) on Investments [Line Items]
AFS unrealized losses less than 12 months	(4,858)	(290)
AFS Fair Value less than 12 months	69,211	45,579
AFS unrealized losses 12 months of longer	(1,578)	0
AFS Fair Value 12 months or longer	15,341	0
AFS total unrealized losses	(6,436)	(290)
Total Fair Value AFS	84,552	45,579
Total held-to-maturity Securities [Member]
Gain (Loss) on Investments [Line Items]
Held-to-maturity Securities, unrealized losses, less than 12 months	(361)
Held-to-maturity Securities fair value, Less than Twelve Months	4,742
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	(361)
Total fair value Held-to-maturity Securities	4,742
Total securities [Member]
Gain (Loss) on Investments [Line Items]
Total Securities unrealized Loss Position Less than 12 months	(5,219)
Total Securities Unrealized Loss Position Less than 12 months Fair Value	73,953
Total Securities, Unrealized Loss Position ,12 months or Longer	(1,578)
Total Securities, Unrealized Loss Position, 12 months or Longer, Fair Value	15,341
Unrealized Loss on Securities	(6,797)
Total securities Estimated Fair Value	$ 89,294