ALLOWANCE FOR LOAN LOSSES AND RESERVE FOR FIRST LOSS POSITION (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Financing Receivable, Allowance for Credit Losses [Line Items]
Number of components	4
Non-Impaired Substandard Component of the Allowance for Loans Losses	$ 795	$ 0
Periodic Change in Balance of Non-Impaired Substandard Loans	11,614
Financing Receivable Allowance for credit losses, Special mention loans	145	800
One To Four Family Residential And Cooperative Unit Allowance [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance	480	409	1,047
Provision (credit) for loan losses	624	200	(372)
Charge-offs	(777)	(129)	(266)
Recoveries	17	0	0
Transfer from (to) reserve for loan Commitments	0	0	0
Ending Balance	344	480	409
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Loans, Individually Evaluated for Impairment	1,291	2,547
Loans, Collectively Evaluated for Impairment	90,585	98,165
Allowance for Credit Losses, Individually Evaluated for Impairment	7	130
Allowance for Credit Losses, Collectively Evaluated for Impairment	337	350
Multifamily Residential And Residential Mixed Use Allowance [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance	14,313	14,226	13,547
Provision (credit) for loan losses	1,583	2,505	10,498
Charge-offs	(2,478)	(2,803)	(10,062)
Recoveries	829	220	55
Transfer from (to) reserve for loan Commitments	52	165	188
Ending Balance	14,299	14,313	14,226
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Loans, Individually Evaluated for Impairment	2,460	10,028
Loans, Collectively Evaluated for Impairment	2,673,909	2,592,891
Allowance for Credit Losses, Individually Evaluated for Impairment	0	45
Allowance for Credit Losses, Collectively Evaluated for Impairment	14,299	14,268
Mixed Use Commercial Real Estate Allowance [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance	1,528	1,331	1,833
Provision (credit) for loan losses	1,744	861	(98)
Charge-offs	(821)	(697)	(469)
Recoveries	18	48	0
Transfer from (to) reserve for loan Commitments	5	(15)	65
Ending Balance	2,474	1,528	1,331
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Loans, Individually Evaluated for Impairment	1,900	6,739
Loans, Collectively Evaluated for Impairment	338,233	331,531
Allowance for Credit Losses, Individually Evaluated for Impairment	0	73
Allowance for Credit Losses, Collectively Evaluated for Impairment	2,474	1,455
Total Real Estate Loans Receivable [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance	20,228	19,132	21,475
Provision (credit) for loan losses	3,910	6,825	11,193
Charge-offs	(4,600)	(6,311)	(13,872)
Recoveries	903	415	64
Transfer from (to) reserve for loan Commitments	82	167	272
Ending Balance	20,523	20,228	19,132
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Loans, Individually Evaluated for Impairment	53,144	70,384
Loans, Collectively Evaluated for Impairment	3,450,241	3,388,032
Allowance for Credit Losses, Individually Evaluated for Impairment	520	2,175
Allowance for Credit Losses, Collectively Evaluated for Impairment	20,003	18,053
Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance	26	34	30
Provision (credit) for loan losses	11	21	17
Charge-offs	(10)	(29)	(13)
Recoveries	0	0	0
Transfer from (to) reserve for loan Commitments	0	0	0
Ending Balance	27	26	34
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Loans, Individually Evaluated for Impairment	0	0
Loans, Collectively Evaluated for Impairment	2,423	2,449
Allowance for Credit Losses, Individually Evaluated for Impairment	0	0
Allowance for Credit Losses, Collectively Evaluated for Impairment	27	26
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance	3,783	2,821	3,918
Provision (credit) for loan losses	56	2,548	875
Charge-offs	(521)	(1,720)	(1,964)
Recoveries	39	147	9
Transfer from (to) reserve for loan Commitments	25	(13)	(17)
Ending Balance	3,382	3,783	2,821
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Loans, Individually Evaluated for Impairment	47,493	51,070
Loans, Collectively Evaluated for Impairment	347,038	362,246
Allowance for Credit Losses, Individually Evaluated for Impairment	513	1,927
Allowance for Credit Losses, Collectively Evaluated for Impairment	2,869	1,856
Construction [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance	124	345	1,130
Provision (credit) for loan losses	(97)	711	290
Charge-offs	(3)	(962)	(1,111)
Recoveries	0	0	0
Transfer from (to) reserve for loan Commitments	0	30	36
Ending Balance	24	124	345
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Loans, Individually Evaluated for Impairment	0	0
Loans, Collectively Evaluated for Impairment	476	3,199
Allowance for Credit Losses, Individually Evaluated for Impairment	0	0
Allowance for Credit Losses, Collectively Evaluated for Impairment	$ 24	$ 124