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, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013	Dec. 31, 2013
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for Loan Losses at Period End on Substandard Non Impaired Loans	$ 154				$ 154			$ 53
Increase (Decrease) in the balance of Substandard non-impaired loans					857
Financing Receivable Special Mention Allowance For Loan Losses period end balance	350				350			185
Financing Receivable Special Mention Balance Increase (Decrease)					13,125
Reserve For First Loss Position [Abstract]
Outstanding balance of multifamily loans serviced for FNMA at period end	0		216,073		0		216,073
First Loss Position Loans Serviced For Fnma	0		15,428		0		15,428
Reserve Liability On The First Loss Position [Roll Forward]
Balance at beginning of period	0		1,188		1,040		1,383
Credit for losses on problem loans(1)	0	[1]	(50)	[1]	(1,040)		(245)
Charge-offs and other net reductions in balance	0		(38)		0		(38)
Balance at period end	0		1,100		0		1,100
One To Four Family Residential And Cooperative Unit Allowance [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	304		352		236		344
Provision (credit) for loan losses	(88)		(75)		(118)		29
Charge-offs	(14)		(11)		(37)		(110)
Recoveries	1		8		122		11
Ending balance	203		274		203		274
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Ending balance - loans individually evaluated for impairment	607				607			1,199
Ending balance - loans collectively evaluated for impairment	74,969				74,969			72,757
Allowance balance associated with loans individually evaluated for impairment	0				0			0
Allowance balance associated with loans collectivelly evaluated for impairment	203				203			236
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	648				648			1,066
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0				0			255
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	607	[2]			607	[2]		987	[2]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0	[2]			0	[2]		212	[2]
Impaired Financing Receivables With No Allocated Reserves Within Allowance For Loan Losses Recognized For Impaired Receivables	0				0			0
Impaired Financing Receivables With Allocated Reserves Within Allowance For Loan Losses Recognized For Impaired Receivables	0				0			0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	769		993		783		1,016
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0		212		52		212
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	12		11		47		27
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		5		0		14
Multifamily Residential And Residential Mixed Use Allowance [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	14,319		14,620		13,840		14,299
Provision (credit) for loan losses	(115)		1,382		239		1,840
Charge-offs	(19)		(205)		(69)		(362)
Recoveries	0		13		175		33
Ending balance	14,185		15,810		14,185		15,810
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Ending balance - loans individually evaluated for impairment	2,154				2,154			2,345
Ending balance - loans collectively evaluated for impairment	3,217,553				3,217,553			2,920,205
Allowance balance associated with loans individually evaluated for impairment	0				0			0
Allowance balance associated with loans collectivelly evaluated for impairment	14,185				14,185			13,840
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	2,154				2,154			2,494
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0				0			0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	2,154	[2]			2,154	[2]		2,345	[2]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0	[2]			0	[2]		0	[2]
Impaired Financing Receivables With No Allocated Reserves Within Allowance For Loan Losses Recognized For Impaired Receivables	0				0			0
Impaired Financing Receivables With Allocated Reserves Within Allowance For Loan Losses Recognized For Impaired Receivables	0				0			0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	2,483		3,552		2,366		2,977
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0		0		0		0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	16		49		72		129
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		0		0		0
Commercial Mixed Use Real Estate Allowance [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	1,609		2,215		3,003		2,474
Provision (credit) for loan losses	198		(443)		(1,508)		(716)
Charge-offs	0		0		(30)		(15)
Recoveries	19		0		361		29
Ending balance	1,826		1,772		1,826		1,772
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Ending balance - loans individually evaluated for impairment	4,400				4,400			4,400
Ending balance - loans collectively evaluated for impairment	337,957				337,957			371,510
Allowance balance associated with loans individually evaluated for impairment	0				0			1,320
Allowance balance associated with loans collectivelly evaluated for impairment	1,826				1,826			1,683
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	4,445				4,445			0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0				0			4,500
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	4,400	[2]			4,400	[2]		0	[2]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0	[2]			0	[2]		4,400	[2]
Impaired Financing Receivables With No Allocated Reserves Within Allowance For Loan Losses Recognized For Impaired Receivables	0				0			0
Impaired Financing Receivables With Allocated Reserves Within Allowance For Loan Losses Recognized For Impaired Receivables	0				0			1,320
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	2,200		1,289		2,200		1,590
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	2,200		0		2,200		0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	44		17		193		110
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		0		0		0
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	3,377		3,279		3,047		3,382
Provision (credit) for loan losses	(498)		(618)		34		(719)
Charge-offs	(22)		(1)		(232)		(5)
Recoveries	1		0		9		2
Ending balance	2,858		2,660		2,858		2,660
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Ending balance - loans individually evaluated for impairment	13,742				13,742			22,245
Ending balance - loans collectively evaluated for impairment	399,880				399,880			302,451
Allowance balance associated with loans individually evaluated for impairment	37				37			451
Allowance balance associated with loans collectivelly evaluated for impairment	2,821				2,821			2,596
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	10,316				10,316			8,316
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	5,525				5,525			15,042
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	8,217	[2]			8,217	[2]		7,203	[2]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	5,525	[2]			5,525	[2]		15,042	[2]
Impaired Financing Receivables With No Allocated Reserves Within Allowance For Loan Losses Recognized For Impaired Receivables	0				0			0
Impaired Financing Receivables With Allocated Reserves Within Allowance For Loan Losses Recognized For Impaired Receivables	37				37			451
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	6,863		22,991		7,286		26,682
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	10,259		15,155		10,272		15,199
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	79		187		120		949
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	73		275		423		671
Construction Loan Receivable [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	0		12		3		24
Provision (credit) for loan losses	0		(11)		(3)		(23)
Charge-offs	0		0		0		0
Recoveries	0		0		0		0
Ending balance	0		1		0		1
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Ending balance - loans individually evaluated for impairment	0				0			0
Ending balance - loans collectively evaluated for impairment	0				0			268
Allowance balance associated with loans individually evaluated for impairment	0				0			0
Allowance balance associated with loans collectivelly evaluated for impairment	0				0			3
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	[2]			0	[2]		0	[2]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0	[2]			0	[2]		0	[2]
Impaired Financing Receivables With No Allocated Reserves Within Allowance For Loan Losses Recognized For Impaired Receivables	0				0			0
Impaired Financing Receivables With 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		0		0		0
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		0
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		0		0		0
Total Real Estate Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	19,609		20,478		20,129		20,523
Provision (credit) for loan losses	(503)		235		(1,356)		411
Charge-offs	(55)		(217)		(368)		(492)
Recoveries	21		21		667		75
Ending balance	19,072		20,517		19,072		20,517
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Ending balance - loans individually evaluated for impairment	20,903				20,903			30,189
Ending balance - loans collectively evaluated for impairment	4,030,359				4,030,359			3,667,191
Allowance balance associated with loans individually evaluated for impairment	37				37			1,771
Allowance balance associated with loans collectivelly evaluated for impairment	19,035				19,035			18,358
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	17,563				17,563			11,876
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	5,525				5,525			19,797
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	15,378	[2]			15,378	[2]		10,535	[2]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	5,525	[2]			5,525	[2]		19,654	[2]
Impaired Financing Receivables With No Allocated Reserves Within Allowance For Loan Losses Recognized For Impaired Receivables	0				0			0
Impaired Financing Receivables With Allocated Reserves Within Allowance For Loan Losses Recognized For Impaired Receivables	37				37			1,771
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	12,315		28,825		12,635		32,265
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	12,459		15,367		12,524		15,411
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	151		264		432		1,215
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	73		280		423		685
Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	24		24		24		27
Provision (credit) for loan losses	2		5		6		14
Charge-offs	0		(6)		(4)		(18)
Recoveries	0		0		0		0
Ending balance	26		23		26		23
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Ending balance - loans individually evaluated for impairment	0				0			0
Ending balance - loans collectively evaluated for impairment	1,913				1,913			2,139
Allowance balance associated with loans individually evaluated for impairment	0				0			0
Allowance balance associated with loans collectivelly evaluated for impairment	$ 26				$ 26			$ 24

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

[2] The recorded investment excludes accrued interest receivable and loan origination fees, net, due to immateriality.