ALLOWANCE FOR LOAN LOSSES AND RESERVE FOR FIRST LOSS POSITION ON MULTIFAMILY LOANS SOLD TO FNMA (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2012		Sep. 30, 2011		Dec. 31, 2011
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Financing Receivable Substandard Non-impaired loans period end balance	$ 867				$ 867
Increase (Decrease) in the balance of Substandard non-impaired loans					12,905
Financing Receivable Special Mention Allowance For Loan Losses period end balance	100				100				800
Financing Receivable Special Mention Balance Increase (Decrease)					(15,211)
Reserve For First Loss Position [Abstract]
Residential Mortgage Loans Serviced Outstanding Principal	279,830		318,113		279,830		318,113
First Loss Position Loans Serviced For Fnma	16,356		16,356		16,356		16,356
Balance at beginning of period	1,684		2,993		2,993		2,993
Transfer of specific reserve for serviced loans re-acquired by the bank	0		0		0		0
Provision for losses on problem loans	(140)	[1]	0	[1]	(1,107)	[1]	0	[1]
Charge-offs and other net reductions in balance	0		0		(342)		0
Balance at end of period	1,544		2,993		1,544		2,993
One To Four Family Residential And Cooperative Unit Allowance [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses, Beginning Balance	258		399		480		409
Provision for Loan, Lease, and Other Losses	557		(12)		959		61
Financing Receivable, Allowance for Credit Losses, Write-downs	(134)		(5)		(774)		(88)
Financing Receivable, Allowance for Credit Losses, Recovery	1		0		17		0
Financing Receivable Allowance For Credit Losses Transfers	0		0		0		0
Financing Receivable, Allowance for Credit Losses, Ending Balance	682		382		682		382
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Financing Receivable, Individually Evaluated for Impairment	621				621				2,547
Financing Receivable, Collectively Evaluated for Impairment	88,204				88,204				98,165
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	8				8				130
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	674				674				350
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	409				409				1,136
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	212				212				1,411
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	409				409				1,136
Impaired Financing Receivable, with Related Allowance, Recorded Investment	212				212				1,411
Impaired Financing Receivables With Allocated Reserves Within Allowance For Loan Losses Recognized For Impaired Receivables	8				8				130
Impaired Financing Receivables With No Allocated Reserves Within Allowance For Loan Losses Recognized For Impaired Receivables	0				0				0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	629		1,121		814		1,475
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	212		706		511		353
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	15		7		48		24
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	5		0		14		0
Multifamily Residential And Residential Mixed Use Allowance [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses, Beginning Balance	14,551		14,396		14,313		14,226
Provision for Loan, Lease, and Other Losses	(761)		230		1,477		610
Financing Receivable, Allowance for Credit Losses, Write-downs	(243)		(40)		(2,381)		(552)
Financing Receivable, Allowance for Credit Losses, Recovery	687		1		773		143
Financing Receivable Allowance For Credit Losses Transfers	0		(39)		52		121
Financing Receivable, Allowance for Credit Losses, Ending Balance	14,234		14,548		14,234		14,548
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Financing Receivable, Individually Evaluated for Impairment	3,319				3,319				10,028
Financing Receivable, Collectively Evaluated for Impairment	2,491,320				2,491,320				2,592,891
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0				0				45
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	14,234				14,234				14,268
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	3,319				3,319				9,338
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0				0				690
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	3,319				3,319				9,338
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0				0				690
Impaired Financing Receivables With Allocated Reserves Within Allowance For Loan Losses Recognized For Impaired Receivables	0				0				45
Impaired Financing Receivables With No Allocated Reserves Within Allowance For Loan Losses Recognized For Impaired Receivables	0				0				0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	4,787		10,904		6,178		11,912
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0		6,549		525		3,275
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	49		181		305		427
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		82		0		82
Mixed Use Commercial Real Estate Allowance [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses, Beginning Balance	2,181		1,108		1,528		1,331
Provision for Loan, Lease, and Other Losses	143		432		1,442		476
Financing Receivable, Allowance for Credit Losses, Write-downs	(8)		(79)		(670)		(362)
Financing Receivable, Allowance for Credit Losses, Recovery	0		14		11		36
Financing Receivable Allowance For Credit Losses Transfers	0		(5)		5		(11)
Financing Receivable, Allowance for Credit Losses, Ending Balance	2,316		1,470		2,316		1,470
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Financing Receivable, Individually Evaluated for Impairment	1,456				1,456				6,739
Financing Receivable, Collectively Evaluated for Impairment	342,490				342,490				331,531
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0				0				73
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	2,316				2,316				1,455
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	1,456				1,456				5,780
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0				0				959
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	1,456				1,456				5,780
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0				0				959
Impaired Financing Receivables With Allocated Reserves Within Allowance For Loan Losses Recognized For Impaired Receivables	0				0				73
Impaired Financing Receivables With No Allocated Reserves Within Allowance For Loan Losses Recognized For Impaired Receivables	0				0				0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	1,459		3,131		2,670		3,431
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0		4,253		240		2,126
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	12		67		56		152
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		8		0		8
Total Real Estate Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses, Beginning Balance	20,220		19,489		20,228		19,132
Provision for Loan, Lease, and Other Losses	123		2,213		3,848		5,293
Financing Receivable, Allowance for Credit Losses, Write-downs	(398)		(170)		(4,328)		(3,369)
Financing Receivable, Allowance for Credit Losses, Recovery	723		27		838		325
Financing Receivable Allowance For Credit Losses Transfers	0		(48)		82		130
Financing Receivable, Allowance for Credit Losses, Ending Balance	20,668		21,511		20,668		21,511
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Financing Receivable, Individually Evaluated for Impairment	52,983				52,983				70,384
Financing Receivable, Collectively Evaluated for Impairment	3,270,518				3,270,518				3,388,032
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	551				551				2,175
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	20,117				20,117				18,053
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	37,513				37,513				28,066
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	15,470				15,470				42,318
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	37,513				37,513				28,066
Impaired Financing Receivable, with Related Allowance, Recorded Investment	15,470				15,470				42,318
Impaired Financing Receivables With Allocated Reserves Within Allowance For Loan Losses Recognized For Impaired Receivables	551				551				2,175
Impaired Financing Receivables With No Allocated Reserves Within Allowance For Loan Losses Recognized For Impaired Receivables	0				0				0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	40,471		37,329		38,310		37,055
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	15,496		25,083		22,566		15,465
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	480		396		1,727		1,102
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	194		141		581		400
Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses, Beginning Balance	23		29		26		34
Provision for Loan, Lease, and Other Losses	3		4		10		12
Financing Receivable, Allowance for Credit Losses, Write-downs	0		(5)		(10)		(18)
Financing Receivable, Allowance for Credit Losses, Recovery	0		0		0		0
Financing Receivable Allowance For Credit Losses Transfers	0		0		0		0
Financing Receivable, Allowance for Credit Losses, Ending Balance	26		28		26		28
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Financing Receivable, Individually Evaluated for Impairment	0				0				0
Financing Receivable, Collectively Evaluated for Impairment	2,492				2,492				2,449
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0				0				0
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	26				26				26
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses, Beginning Balance	3,230		3,407		3,783		2,821
Provision for Loan, Lease, and Other Losses	157		1,562		64		3,596
Financing Receivable, Allowance for Credit Losses, Write-downs	(14)		(46)		(500)		(1,642)
Financing Receivable, Allowance for Credit Losses, Recovery	36		12		37		146
Financing Receivable Allowance For Credit Losses Transfers	0		(9)		25		5
Financing Receivable, Allowance for Credit Losses, Ending Balance	3,409		4,926		3,409		4,926
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Financing Receivable, Individually Evaluated for Impairment	47,587				47,587				51,070
Financing Receivable, Collectively Evaluated for Impairment	347,976				347,976				362,246
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	543				543				1,927
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	2,866				2,866				1,856
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	32,329				32,329				11,812
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	15,258				15,258				39,258
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	32,329				32,329				11,812
Impaired Financing Receivable, with Related Allowance, Recorded Investment	15,258				15,258				39,258
Impaired Financing Receivables With Allocated Reserves Within Allowance For Loan Losses Recognized For Impaired Receivables	543				543				1,927
Impaired Financing Receivables With No Allocated Reserves Within Allowance For Loan Losses Recognized For Impaired Receivables	0				0				0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	35,596		17,290		28,648		16,100
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	15,284		13,573		21,290		9,711
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	404		141		1,318		286
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	189		51		567		310
Construction Loan Receivable [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses, Beginning Balance	0		179		124		345
Provision for Loan, Lease, and Other Losses	27		1		(94)		550
Financing Receivable, Allowance for Credit Losses, Write-downs	0		0		(3)		(725)
Financing Receivable, Allowance for Credit Losses, Recovery	0		0		0		0
Financing Receivable Allowance For Credit Losses Transfers	0		5		0		15
Financing Receivable, Allowance for Credit Losses, Ending Balance	27		185		27		185
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Financing Receivable, Individually Evaluated for Impairment	0				0				0
Financing Receivable, Collectively Evaluated for Impairment	528				528				3,199
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0				0				0
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	27				27				124
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0				0				0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0				0				0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0				0				0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0				0				0
Impaired Financing Receivables With Allocated Reserves Within Allowance For Loan Losses Recognized For Impaired Receivables	0				0				0
Impaired Financing Receivables With No Allocated Reserves Within Allowance For Loan Losses Recognized For Impaired Receivables	0				0				0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0		4,883		0		4,137
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0		0		0		0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0		0		0		213
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	$ 0		$ 0		$ 0		$ 0

[1] (1) Amount recognized as a component of mortgage banking income during the period.