Loan Receivable and Allowance for Loan and Lease Losses Allowance for Loan Losses (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Mar. 31, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Allowance			$ 19,821	$ 23,148
Deductions (Charges)	5,784	16,828	5,784	16,828
Valuation Allowances and Reserves, Recoveries			60	1,802
Provision for loan losses	(398)	113	386	12,290
Loans and Leases Receivable, Allowance	14,483	20,411	14,483	20,411
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	11,826		11,826		18,872
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	2,657		2,657		949
Loans and Leases Receivable, Net of Deferred Income	364,454		364,454		412,858
Financing Receivable, Collectively Evaluated for Impairment	334,776		334,776		376,826
Financing Receivable, Individually Evaluated for Impairment	29,678		29,678		36,032
One- to four family loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Allowance			4,305	2,923
Deductions (Charges)	2,103	857	2,103	857
Valuation Allowances and Reserves, Recoveries			0	0
Provision for loan losses			2,394	1,143
Loans and Leases Receivable, Allowance	4,596	3,209	4,596	3,209
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	4,217		4,217		4,098
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	379		379		207
Loans and Leases Receivable, Net of Deferred Income	61,726		61,726		66,172
Financing Receivable, Collectively Evaluated for Impairment	54,939		54,939		63,866
Financing Receivable, Individually Evaluated for Impairment	6,787		6,787		2,306
Multifamily Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Allowance			5,409	6,223
Deductions (Charges)	226	5,588	226	5,588
Valuation Allowances and Reserves, Recoveries			0	6
Provision for loan losses			(4,155)	7,047
Loans and Leases Receivable, Allowance	1,028	7,688	1,028	7,688
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	1,028		1,028		5,348
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0		0		61
Loans and Leases Receivable, Net of Deferred Income	67,058		67,058		78,984
Financing Receivable, Collectively Evaluated for Impairment	67,058		67,058		77,976
Financing Receivable, Individually Evaluated for Impairment	0		0		1,008
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Allowance			6,709	3,999
Deductions (Charges)	1,149	4,285	1,149	4,285
Valuation Allowances and Reserves, Recoveries			0	2
Provision for loan losses			(921)	6,089
Loans and Leases Receivable, Allowance	4,639	5,805	4,639	5,805
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	4,182		4,182		6,177
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	457		457		532
Loans and Leases Receivable, Net of Deferred Income	200,641		200,641		206,022
Financing Receivable, Collectively Evaluated for Impairment	184,742		184,742		185,249
Financing Receivable, Individually Evaluated for Impairment	15,899		15,899		20,773
Construction Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Allowance			1,532	6,944
Deductions (Charges)	151	5,692	151	5,692
Valuation Allowances and Reserves, Recoveries			22	1,685
Provision for loan losses			(1,403)	(800)
Loans and Leases Receivable, Allowance	0	2,137	0	2,137
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	0		0		1,484
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0		0		48
Loans and Leases Receivable, Net of Deferred Income	1,230		1,230		16,433
Financing Receivable, Collectively Evaluated for Impairment	0		0		10,346
Financing Receivable, Individually Evaluated for Impairment	1,230		1,230		6,087
Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Allowance			1,786	2,965
Deductions (Charges)	2,152	398	2,152	398
Valuation Allowances and Reserves, Recoveries			34	109
Provision for loan losses			4,521	(1,203)
Loans and Leases Receivable, Allowance	4,189	1,473	4,189	1,473
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	2,368		2,368		1,685
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	1,821		1,821		101
Loans and Leases Receivable, Net of Deferred Income	33,519		33,519		43,982
Financing Receivable, Collectively Evaluated for Impairment	27,757		27,757		38,124
Financing Receivable, Individually Evaluated for Impairment	5,762		5,762		5,858
Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Allowance			80	93
Deductions (Charges)	3	8	3	8
Valuation Allowances and Reserves, Recoveries			4	0
Provision for loan losses			(50)	14
Loans and Leases Receivable, Allowance	31	99	31	99
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	31		31		80
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0		0		0
Loans and Leases Receivable, Net of Deferred Income	280		280		1,265
Financing Receivable, Collectively Evaluated for Impairment	280		280		1,265
Financing Receivable, Individually Evaluated for Impairment	$ 0		$ 0		$ 0