Loan Receivable and Allowance for Loan and Lease Losses Past due financing receivable (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Jun. 30, 2012		Mar. 31, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	$ 2,839		$ 21,030
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	4,325		1,382
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	19,836
Financing Receivable, Recorded Investment, Past Due	27,000		53,876
impaired loans	669	[1]	2,081	[1]
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	19,130	[2]
Loans Receivable, Net	343,101		335,859
Loans and Leases Receivable, Gross, Carrying Amount	391,790		414,830
Loans and Leases Receivable, Net of Deferred Income	389,900		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	0		2,381
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	268		0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	4,525		4,681
Financing Receivable, Recorded Investment, Past Due	4,793		7,062
impaired loans	0	[1]	0	[1]
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	2,838	[2]	2,306	[3]
Loans Receivable, Net	58,605		56,804
Loans and Leases Receivable, Gross, Carrying Amount	66,236		66,172
Multifamily Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	0		3,220
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	416		427
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	799		1,915
Financing Receivable, Recorded Investment, Past Due	1,215		5,562
impaired loans	0	[1]	0	[1]
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	991	[2]	1,008	[3]
Loans Receivable, Net	72,896		72,414
Loans and Leases Receivable, Gross, Carrying Amount	75,102		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	2,814		11,455
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	1,924		0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	4,650		9,406
Financing Receivable, Recorded Investment, Past Due	9,388		20,861
impaired loans	598	[1]	2,000	[1]
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	11,239	[2]	13,061	[3]
Loans Receivable, Net	177,046		170,099
Loans and Leases Receivable, Gross, Carrying Amount	198,271		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	4,658		11,086
Financing Receivable, Recorded Investment, Past Due	4,658		11,086
impaired loans	0	[1]	0	[1]
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0	[2]	239	[3]
Loans Receivable, Net	4,094		5,108
Loans and Leases Receivable, Gross, Carrying Amount	8,752		16,433
Commercial Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	0		3,937
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	1,696		954
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	5,204		4,353
Financing Receivable, Recorded Investment, Past Due	6,900		9,244
impaired loans	71	[1]	81	[1]
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	4,062	[2]	4,428	[3]
Loans Receivable, Net	30,076		30,229
Loans and Leases Receivable, Gross, Carrying Amount	41,109		43,982
Consumer Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	25		37
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	21		1
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	0		23
Financing Receivable, Recorded Investment, Past Due	46		61
impaired loans	0	[1]	0	[1]
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0	[2]	0	[3]
Loans Receivable, Net	384		1,204
Loans and Leases Receivable, Gross, Carrying Amount	$ 430		$ 1,265

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

[2] (2) Excludes $5.2 million TDR loans that have performed in accordance with their modified terms for at least six months and are considered performing. These loans are classified as current.

[3] (2) Excludes $3.5 million TDR loans that have performed in accordance with their modified terms for at least six months and are considered performing. These loans are classified as current.