Loan and Lease Losses Past due financing receivable (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	$ 1,073		$ 21,030
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	2,165		1,382
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	9,072		31,464
Financing Receivable, Recorded Investment, Past Due	12,310		53,876
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	21,700		21,042
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	16,685
Troubled Debt Restructuring, Debtor, Other	5,040	[1]	3,461	[1]
Financing Receivable, Recorded Investment, Current	331,218		332,397
Loans Receivable, Net	370,122		412,858
Loans and Leases Receivable, Gross, Carrying Amount	371,135		414,830
Loans and Leases Receivable, Net of Deferred Income	370,122		412,858
One- to four family loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	348		2,381
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	28		0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	4,501		4,681
Financing Receivable, Recorded Investment, Past Due	4,877		7,062
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	3,141		2,306
Impaired Financing Receivable, Unpaid Principal Balance	0	[2]	0	[2]
Troubled Debt Restructuring, Debtor, Other	2,670	[1]	2,690	[1]
Financing Receivable, Recorded Investment, Current	63,299		54,114
Loans Receivable, Net	73,987		66,172
Multifamily Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	238		3,220
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	1,142		427
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	423		1,915
Financing Receivable, Recorded Investment, Past Due	1,803		5,562
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0		1,008
Impaired Financing Receivable, Unpaid Principal Balance	0	[2]	0	[2]
Troubled Debt Restructuring, Debtor, Other	616	[1]	0	[1]
Financing Receivable, Recorded Investment, Current	54,188		72,414
Loans Receivable, Net	56,607		78,984
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	220		11,455
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	846		0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	2,671		9,406
Financing Receivable, Recorded Investment, Past Due	3,737		20,861
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	9,097		13,061
Impaired Financing Receivable, Unpaid Principal Balance	3,020	[2]	2,000	[2]
Troubled Debt Restructuring, Debtor, Other	1,290	[1]	430	[1]
Financing Receivable, Recorded Investment, Current	185,627		169,669
Loans Receivable, Net	202,771		206,022
Construction Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	0		0
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	0		0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	0		11,086
Financing Receivable, Recorded Investment, Past Due	0		11,086
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0		239
Impaired Financing Receivable, Unpaid Principal Balance	1,230	[2]	0	[2]
Troubled Debt Restructuring, Debtor, Other	0	[1]	0	[1]
Financing Receivable, Recorded Investment, Current	0		5,108
Loans Receivable, Net	1,230		16,433
Commercial Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	261		3,937
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	148		954
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	1,439		4,353
Financing Receivable, Recorded Investment, Past Due	1,848		9,244
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	4,447		4,428
Impaired Financing Receivable, Unpaid Principal Balance	619	[2]	81	[2]
Troubled Debt Restructuring, Debtor, Other	464	[1]	341	[1]
Financing Receivable, Recorded Investment, Current	27,899		29,888
Loans Receivable, Net	35,277		43,982
Consumer Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	6		37
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	1		1
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	38		23
Financing Receivable, Recorded Investment, Past Due	45		61
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0		0
Impaired Financing Receivable, Unpaid Principal Balance	0	[2]	0	[2]
Troubled Debt Restructuring, Debtor, Other	0	[1]	0	[1]
Financing Receivable, Recorded Investment, Current	205		1,204
Loans Receivable, Net	250		1,265
Loans Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	$ 4,869	[2]	$ 2,081	[2]

[1] The performing TDR category details those loans that the Company has determined that the future collection of principal and interest is reasonably assured. This generally represents those borrowers who have performed according to the restructured terms for a period of at least six months.

[2] onsists of loans which are less than 90 days past due but impaired due to other risk characteristics.