Loan Receivable and Allowance for Loan and Lease Losses Past due financing receivable (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended		12 Months Ended
	Dec. 31, 2012		Mar. 31, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	$ 18,485		$ 21,030
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	5,118		1,382
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	12,029		31,464
Financing Receivable, Recorded Investment, Past Due	35,632		53,876
Impaired Financing Receivable, Unpaid Principal Balance	32,867		39,309
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	18,003		21,042
Troubled Debt Restructuring, Debtor, Other	5,099	[1]	3,461	[1]
Loans Receivable, Net	300,186		332,397
Loans and Leases Receivable, Gross, Carrying Amount	366,176		414,830
Loans and Leases Receivable, Net of Deferred Income	364,454		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	4,783		2,381
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	574		0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	4,180		4,681
Financing Receivable, Recorded Investment, Past Due	9,537		7,062
Impaired Financing Receivable, Unpaid Principal Balance	0	[2]	0	[2]
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	3,069		2,306
Troubled Debt Restructuring, Debtor, Other	2,675	[1]	2,690	[1]
Loans Receivable, Net	46,445		54,114
Loans and Leases Receivable, Gross, Carrying Amount	61,726		66,172
Multifamily Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	1,579		3,220
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	1,144		427
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	483		1,915
Financing Receivable, Recorded Investment, Past Due	3,206		5,562
Impaired Financing Receivable, Unpaid Principal Balance	0	[2]	0	[2]
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0		1,008
Troubled Debt Restructuring, Debtor, Other	616	[1]	0	[1]
Loans Receivable, Net	63,236		72,414
Loans and Leases Receivable, Gross, Carrying Amount	67,058		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	11,516		11,455
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	1,681		0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	4,887		9,406
Financing Receivable, Recorded Investment, Past Due	18,084		20,861
Impaired Financing Receivable, Unpaid Principal Balance	3,618	[2]	2,000	[2]
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	10,367		13,061
Troubled Debt Restructuring, Debtor, Other	1,299	[1]	430	[1]
Loans Receivable, Net	167,273		169,669
Loans and Leases Receivable, Gross, Carrying Amount	200,641		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
Impaired Financing Receivable, Unpaid Principal Balance	1,230	[2]	0	[2]
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0		239
Troubled Debt Restructuring, Debtor, Other	0	[1]	0	[1]
Loans Receivable, Net	0		5,108
Loans and Leases Receivable, Gross, Carrying Amount	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	576		3,937
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	1,713		954
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	2,465		4,353
Financing Receivable, Recorded Investment, Past Due	4,754		9,244
Impaired Financing Receivable, Unpaid Principal Balance	686	[2]	81	[2]
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	4,567		4,428
Troubled Debt Restructuring, Debtor, Other	509	[1]	341	[1]
Loans Receivable, Net	23,003		29,888
Loans and Leases Receivable, Gross, Carrying Amount	33,519		43,982
Consumer Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	31		37
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	6		1
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	14		23
Financing Receivable, Recorded Investment, Past Due	51		61
Impaired Financing Receivable, Unpaid Principal Balance	0	[2]	0	[2]
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0		0
Troubled Debt Restructuring, Debtor, Other	0	[1]	0	[1]
Loans Receivable, Net	229		1,204
Loans and Leases Receivable, Gross, Carrying Amount	280		1,265
Loans Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	$ 5,534	[2]	$ 2,081	[2]

[1] (2) 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] (1) Consists of loans which are less than 90 days past due but impaired due to other risk characteristics.