Loan Receivable and Allowance for Loan and Lease Losses Impaired loans with an allowance recorded (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Jun. 30, 2012	Jun. 30, 2011	Mar. 31, 2012
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Interest Income, Cash Basis Method	$ 388
Impaired Financing Receivable, Recorded Investment	29,878		36,247
Impaired Financing Receivable, Unpaid Principal Balance	31,381		39,309
Impaired Financing Receivable, Related Allowance	1,258		949
Impaired Financing Receivable, Average Recorded Investment	32,723
Multifamily Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Interest Income, Cash Basis Method	0	65
Impaired Financing Receivable, Recorded Investment	798		814
Impaired Financing Receivable, Unpaid Principal Balance	863		879
Impaired Financing Receivable, Related Allowance	61		61
Impaired Financing Receivable, Average Recorded Investment	806	7,304
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Interest Income, Cash Basis Method	95	35
Impaired Financing Receivable, Recorded Investment	5,809		14,469
Impaired Financing Receivable, Unpaid Principal Balance	6,208		15,068
Impaired Financing Receivable, Related Allowance	353		532
Impaired Financing Receivable, Average Recorded Investment	10,139	5,215
Construction Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Interest Income, Cash Basis Method	0	0
Impaired Financing Receivable, Recorded Investment	0		681
Impaired Financing Receivable, Unpaid Principal Balance	0		1,613
Impaired Financing Receivable, Related Allowance	0		48
Impaired Financing Receivable, Average Recorded Investment	0	14,013
Commercial Loan [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Interest Income, Cash Basis Method	81	8
Impaired Financing Receivable, Recorded Investment	2,645		1,089
Impaired Financing Receivable, Unpaid Principal Balance	2,645		1,776
Impaired Financing Receivable, Related Allowance	298		101
Impaired Financing Receivable, Average Recorded Investment	1,867	1,688
Consumer Loan [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Interest Income, Cash Basis Method		0
Impaired Financing Receivable, Recorded Investment	0		0
Impaired Financing Receivable, Unpaid Principal Balance	0		0
Impaired Financing Receivable, Related Allowance	0		0
Impaired Financing Receivable, Average Recorded Investment	0
One- to four family loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Interest Income, Cash Basis Method	7	34
Impaired Financing Receivable, Recorded Investment	3,093		1,679
Impaired Financing Receivable, Unpaid Principal Balance	3,175		1,760
Impaired Financing Receivable, Related Allowance	546		207
Impaired Financing Receivable, Average Recorded Investment	2,386	7,434
Impaired Financing Receivable with Related Allowance [Domain]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Interest Income, Cash Basis Method	183
Impaired Financing Receivable, Recorded Investment	12,345		18,732
Impaired Financing Receivable, Unpaid Principal Balance	12,891		21,096
Impaired Financing Receivable, Related Allowance	1,258		949
Impaired Financing Receivable, Average Recorded Investment	15,198
Class of Financing Receivable [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Interest Income, Cash Basis Method	205	436
Impaired Financing Receivable, Recorded Investment	17,533		17,515
Impaired Financing Receivable, Unpaid Principal Balance	18,490		18,213
Impaired Financing Receivable, Related Allowance	0		0
Impaired Financing Receivable, Average Recorded Investment	17,525	42,248
One- to four family loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Interest Income, Cash Basis Method	9	23
Impaired Financing Receivable, Recorded Investment	828		628
Impaired Financing Receivable, Unpaid Principal Balance	828		628
Impaired Financing Receivable, Related Allowance	0		0
Impaired Financing Receivable, Average Recorded Investment	728	3,855
Consumer Loan [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Interest Income, Cash Basis Method	0	0
Impaired Financing Receivable, Recorded Investment	0		0
Impaired Financing Receivable, Unpaid Principal Balance	0		0
Impaired Financing Receivable, Related Allowance	0		0
Impaired Financing Receivable, Average Recorded Investment	0	0
Commercial Loan [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Interest Income, Cash Basis Method	32	72
Impaired Financing Receivable, Recorded Investment	3,290		4,983
Impaired Financing Receivable, Unpaid Principal Balance	3,290		5,417
Impaired Financing Receivable, Related Allowance	0		0
Impaired Financing Receivable, Average Recorded Investment	4,137	4,569
Construction Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Interest Income, Cash Basis Method	53	325
Impaired Financing Receivable, Recorded Investment	7,250		5,406
Impaired Financing Receivable, Unpaid Principal Balance	7,519		5,670
Impaired Financing Receivable, Related Allowance	0		0
Impaired Financing Receivable, Average Recorded Investment	6,328	20,641
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Interest Income, Cash Basis Method	108	4
Impaired Financing Receivable, Recorded Investment	5,973		6,304
Impaired Financing Receivable, Unpaid Principal Balance	6,661		6,304
Impaired Financing Receivable, Related Allowance	0		0
Impaired Financing Receivable, Average Recorded Investment	6,139	10,695
Multifamily Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Interest Income, Cash Basis Method	3	12
Impaired Financing Receivable, Recorded Investment	192		194
Impaired Financing Receivable, Unpaid Principal Balance	192		194
Impaired Financing Receivable, Related Allowance	0		0
Impaired Financing Receivable, Average Recorded Investment	193	2,488
Multifamily Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Interest Income, Cash Basis Method	3	77
Impaired Financing Receivable, Recorded Investment	990		1,008
Impaired Financing Receivable, Unpaid Principal Balance	1,055		1,073
Impaired Financing Receivable, Related Allowance	61		61
Impaired Financing Receivable, Average Recorded Investment	999	9,792
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Interest Income, Cash Basis Method	203	39
Impaired Financing Receivable, Recorded Investment	11,782		20,773
Impaired Financing Receivable, Unpaid Principal Balance	12,869		21,372
Impaired Financing Receivable, Related Allowance	353		532
Impaired Financing Receivable, Average Recorded Investment	16,278	15,910
Construction Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Interest Income, Cash Basis Method	53	325
Impaired Financing Receivable, Recorded Investment	7,250		6,087
Impaired Financing Receivable, Unpaid Principal Balance	7,519		7,283
Impaired Financing Receivable, Related Allowance	0		48
Impaired Financing Receivable, Average Recorded Investment	6,328	34,654
Commercial Loan [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Interest Income, Cash Basis Method	113	80
Impaired Financing Receivable, Recorded Investment	5,935		6,072
Impaired Financing Receivable, Unpaid Principal Balance	5,935		7,193
Impaired Financing Receivable, Related Allowance	298		101
Impaired Financing Receivable, Average Recorded Investment	6,004	6,257
Consumer Loan [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Interest Income, Cash Basis Method	0	0
Impaired Financing Receivable, Recorded Investment	0		0
Impaired Financing Receivable, Unpaid Principal Balance	0		0
Impaired Financing Receivable, Related Allowance	0		0
Impaired Financing Receivable, Average Recorded Investment	0	0
One- to four family loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Interest Income, Cash Basis Method	16	57
Impaired Financing Receivable, Recorded Investment	3,921		2,307
Impaired Financing Receivable, Unpaid Principal Balance	4,003		2,388
Impaired Financing Receivable, Related Allowance	546		207
Impaired Financing Receivable, Average Recorded Investment	$ 3,114	$ 11,289

Loan Receivable and Allowance for Loan and Lease Losses Impaired loans with an allowance recorded (Details) (USD $)
In Thousands, unless otherwise specified

3 Months Ended

Jun. 30, 2012

Jun. 30, 2011

Mar. 31, 2012

Financing Receivable, Impaired [Line Items]

Impaired Financing Receivable, Interest Income, Cash Basis Method

$ 388

Impaired Financing Receivable, Recorded Investment

29,878

36,247

Impaired Financing Receivable, Unpaid Principal Balance

31,381