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Investment Securities Unrealized losses and fair value of securities (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Mar. 31, 2012
Total mortgage-backed securities AFS
Gain (Loss) on Investments [Line Items]
Total Fair Value AFS	$ 10,298	$ 13,699
AFS Amortized Cost	43,459	45,833
AFS unrealized losses less than 12 months	(104)	(25)
AFS Fair Value less than 12 months	10,298	13,699
AFS unrealized losses 12 months of longer	0	0
AFS Fair Value 12 months or longer	0	0
AFS Gross Unrealized Losses	(104)	(25)
US Government Agency Securities
Gain (Loss) on Investments [Line Items]
Total Fair Value AFS	25,290	9,917
AFS Amortized Cost	44,363	23,176
AFS unrealized losses less than 12 months	(177)	(63)
AFS Fair Value less than 12 months	25,290	9,917
AFS unrealized losses 12 months of longer	0	0
AFS Fair Value 12 months or longer	0	0
AFS Gross Unrealized Losses	(177)	(63)
US Treasury Securities [Member]
Gain (Loss) on Investments [Line Items]
Total Fair Value AFS		1,555
AFS unrealized losses less than 12 months		(1)
AFS Fair Value less than 12 months		1,555
AFS unrealized losses 12 months of longer		0
AFS Fair Value 12 months or longer		0
AFS Gross Unrealized Losses		(1)
Asset-backed Securities [Member]
Gain (Loss) on Investments [Line Items]
AFS Amortized Cost	15,268
AFS Gross Unrealized Losses	0
Other
Gain (Loss) on Investments [Line Items]
Total Fair Value AFS	9,991	9,973
AFS Amortized Cost	10,000	10,485
AFS unrealized losses less than 12 months	(9)	(27)
AFS Fair Value less than 12 months	9,991	9,973
AFS unrealized losses 12 months of longer	0	0
AFS Fair Value 12 months or longer	0	0
AFS Gross Unrealized Losses	(9)	(27)
Debt Securities [Member]
Gain (Loss) on Investments [Line Items]
Total Fair Value AFS	45,579	35,144
AFS unrealized losses less than 12 months	(290)	(116)
AFS Fair Value less than 12 months	45,579	35,144
AFS unrealized losses 12 months of longer	0	0
AFS Fair Value 12 months or longer	0	0
AFS Gross Unrealized Losses	$ (290)	$ (116)

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