Loan and Lease Losses Allowance for Loan Losses (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								4 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Allowance				$ 19,821				$ 23,147		$ 19,821	$ 23,147	$ 12,000
Deductions (Charges)	5,903				21,935				21,935	5,903	21,935	16,019
Valuation Allowances and Reserves, Recoveries									2,267	398	2,267	52
Provision for loan losses	3,713	398	(560)	(224)	(4,052)	(113)	(7,007)	(5,170)		(3,327)	16,342	27,114
Loans and Leases Receivable, Allowance	10,989				19,821				19,821	10,989	19,821	23,147
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	8,678				18,872				18,872	8,678	18,872
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	2,311				949				949	2,311	949	4,200
Loans and Leases Receivable, Net of Deferred Income	370,122				412,858				412,858	370,122	412,858
Financing Receivable, Collectively Evaluated for Impairment	339,100				376,826				376,826	339,100	376,826
Financing Receivable, Individually Evaluated for Impairment	31,022				36,032				36,032	31,022	36,032		69,600
One- to four family loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Allowance				4,305				2,923		4,305	2,923
Deductions (Charges)	2,103				3,730				3,730	2,103	3,730
Valuation Allowances and Reserves, Recoveries										15	469
Provision for loan losses										1,279	4,643
Loans and Leases Receivable, Allowance	3,496				4,305				4,305	3,496	4,305
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	3,179				4,098				4,098	3,179	4,098
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	317				207				207	317	207
Loans and Leases Receivable, Net of Deferred Income	73,987				66,172				66,172	73,987	66,172
Financing Receivable, Collectively Evaluated for Impairment	67,619				63,866				63,866	67,619	63,866
Financing Receivable, Individually Evaluated for Impairment	6,368				2,306				2,306	6,368	2,306
Multifamily Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Allowance				5,409				6,223		5,409	6,223
Deductions (Charges)	226				6,250				6,250	226	6,250
Valuation Allowances and Reserves, Recoveries										91	6
Provision for loan losses										(4,866)	5,430
Loans and Leases Receivable, Allowance	408				5,409				5,409	408	5,409
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	409				5,348				5,348	409	5,348
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0				61				61	0	61
Loans and Leases Receivable, Net of Deferred Income	56,607				78,984				78,984	56,607	78,984
Financing Receivable, Collectively Evaluated for Impairment	55,991				77,976				77,976	55,991	77,976
Financing Receivable, Individually Evaluated for Impairment	616				1,008				1,008	616	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		6,709	3,999
Deductions (Charges)	1,148				5,111				5,111	1,148	5,111
Valuation Allowances and Reserves, Recoveries										0	2
Provision for loan losses										(2,263)	7,819
Loans and Leases Receivable, Allowance	3,298				6,709				6,709	3,298	6,709
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	3,103				6,177				6,177	3,103	6,177
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	194				532				532	194	532
Loans and Leases Receivable, Net of Deferred Income	202,771				206,022				206,022	202,771	206,022
Financing Receivable, Collectively Evaluated for Impairment	186,336				185,249				185,249	186,336	185,249
Financing Receivable, Individually Evaluated for Impairment	16,435				20,773				20,773	16,435	20,773
Construction Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Allowance				1,532				6,944		1,532	6,944
Deductions (Charges)	151				5,961				5,961	151	5,961
Valuation Allowances and Reserves, Recoveries										22	1,677
Provision for loan losses										(1,403)	(1,128)
Loans and Leases Receivable, Allowance	0				1,532				1,532	0	1,532
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	0				1,484				1,484	0	1,484
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0				48				48	0	48
Loans and Leases Receivable, Net of Deferred Income	1,230				16,433				16,433	1,230	16,433
Financing Receivable, Collectively Evaluated for Impairment	0				10,346				10,346	0	10,346
Financing Receivable, Individually Evaluated for Impairment	1,230				6,087				6,087	1,230	6,087
Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Allowance				1,786				2,965		1,786	2,965
Deductions (Charges)	2,274				875				875	2,274	875
Valuation Allowances and Reserves, Recoveries										265	113
Provision for loan losses										3,982	(417)
Loans and Leases Receivable, Allowance	3,759				1,786				1,786	3,759	1,786
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	1,959				1,685				1,685	1,959	1,685
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	1,800				101				101	1,800	101
Loans and Leases Receivable, Net of Deferred Income	35,277				43,982				43,982	35,277	43,982
Financing Receivable, Collectively Evaluated for Impairment	28,904				38,124				38,124	28,904	38,124
Financing Receivable, Individually Evaluated for Impairment	6,373				5,858				5,858	6,373	5,858
Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Allowance				80				93		80	93
Deductions (Charges)	1				8				8	1	8
Valuation Allowances and Reserves, Recoveries										5	0
Provision for loan losses										(56)	(5)
Loans and Leases Receivable, Allowance	28				80				80	28	80
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	28				80				80	28	80
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0				0				0	0	0
Loans and Leases Receivable, Net of Deferred Income	250				1,265				1,265	250	1,265
Financing Receivable, Collectively Evaluated for Impairment	250				1,265				1,265	250	1,265
Financing Receivable, Individually Evaluated for Impairment	$ 0				$ 0				$ 0	$ 0	$ 0