Loan Receivable and Allowance for Loan and Lease Losses Allowance for Loan Losses (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jun. 30, 2012		Jun. 30, 2011	Mar. 31, 2012		Mar. 31, 2011
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Interest Income, Cash Basis Method	$ 388
impaired loans	669	[1]		2,081	[1]
Loans and Leases Receivable, Commercial, Net of Deferred Income	41,109			43,982
Loans Receivable, Gross, Commercial, Mortgage	198,271			206,021
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	4,325			1,382
One- to Four family Residential Loan	66,236			66,172
Loans and Leases Receivable, Allowance	18,607		23,764	19,821		23,147
Deductions (Charges)			4,571	31,464
Other Deductions and Charges	1,443
Valuation Allowances and Reserves, Recoveries	5		18
Provision for loan losses	224		5,170
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	17,350			18,872
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	1,257			949
Loans and Leases Receivable, Net Reported Amount	371,293			393,037
Loans and Leases Receivable, Net of Deferred Income	389,900			412,858
Financing Receivable, Collectively Evaluated for Impairment	360,022			376,826
Financing Receivable, Individually Evaluated for Impairment	29,878			36,032
Financing Receivable, Modifications, Recorded Investment	19,100			21,042	[2]
One- to four family loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Interest Income, Cash Basis Method	7		34
Loans and Leases Receivable, Allowance	4,796		2,826	4,305		2,923
Deductions (Charges)			20
Other Deductions and Charges	203
Valuation Allowances and Reserves, Recoveries	0		0
Provision for loan losses	694		(77)
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	4,250			4,098
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	546			207
Loans and Leases Receivable, Net Reported Amount				66,172
Loans and Leases Receivable, Net of Deferred Income	66,236
Financing Receivable, Collectively Evaluated for Impairment	62,315			63,866
Financing Receivable, Individually Evaluated for Impairment	3,921			2,306
Multifamily Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Interest Income, Cash Basis Method	0		65
Loans and Leases Receivable, Allowance	3,771		7,499	5,409		6,223
Deductions (Charges)			2,408
Other Deductions and Charges	109
Valuation Allowances and Reserves, Recoveries	0		0
Provision for loan losses	(1,529)		3,684
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	3,710			5,348
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	61			61
Loans and Leases Receivable, Net Reported Amount				78,984
Loans and Leases Receivable, Net of Deferred Income	75,102
Financing Receivable, Collectively Evaluated for Impairment	74,111			77,976
Financing Receivable, Individually Evaluated for Impairment	991			1,008
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Interest Income, Cash Basis Method	95		35
Loans and Leases Receivable, Allowance	7,851		4,715	6,709		3,999
Deductions (Charges)			19
Other Deductions and Charges	1,129
Valuation Allowances and Reserves, Recoveries	0		2
Provision for loan losses	2,271		733
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	7,499			6,177
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	352			532
Loans and Leases Receivable, Net Reported Amount				206,022
Loans and Leases Receivable, Net of Deferred Income	198,271
Financing Receivable, Collectively Evaluated for Impairment	186,489			185,249
Financing Receivable, Individually Evaluated for Impairment	11,782			20,773
Construction Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Interest Income, Cash Basis Method	0		0
Loans and Leases Receivable, Allowance	124		6,030	1,532		6,944
Deductions (Charges)			2,124
Other Deductions and Charges	0
Valuation Allowances and Reserves, Recoveries	0		0
Provision for loan losses	(1,408)		1,210
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	124			1,484
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0			48
Loans and Leases Receivable, Net Reported Amount				16,433
Loans and Leases Receivable, Net of Deferred Income	8,752
Financing Receivable, Collectively Evaluated for Impairment	1,502			10,346
Financing Receivable, Individually Evaluated for Impairment	7,250			6,087
Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Interest Income, Cash Basis Method	81		8
Loans and Leases Receivable, Allowance	2,032		2,609	1,786		2,965
Deductions (Charges)			0
Other Deductions and Charges	0
Valuation Allowances and Reserves, Recoveries	2		16
Provision for loan losses	244		(372)
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	1,734			1,685
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	298			101
Loans and Leases Receivable, Net Reported Amount				43,982
Loans and Leases Receivable, Net of Deferred Income	41,109
Financing Receivable, Collectively Evaluated for Impairment	35,175			38,124
Financing Receivable, Individually Evaluated for Impairment	5,934			5,858
Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Interest Income, Cash Basis Method			0
Loans and Leases Receivable, Allowance	33		85	80		93
Deductions (Charges)			0
Other Deductions and Charges	2
Valuation Allowances and Reserves, Recoveries	3		0
Provision for loan losses	(48)		(8)
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	33			80
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0			0
Loans and Leases Receivable, Net Reported Amount				1,265
Loans and Leases Receivable, Net of Deferred Income	430
Financing Receivable, Collectively Evaluated for Impairment	430			1,265
Financing Receivable, Individually Evaluated for Impairment	$ 0			$ 0

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

[2] (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.