LOANS RECEIVABLE AND CREDIT QUALITY, Past Due Financing Receivbles (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013 Loan		Dec. 31, 2012 Loan
Financing Receivable, Recorded Investment, Aging [Abstract]
Number Of Loans 90 Days or More Past Due And Still Accruing Pending Refinancing	5		1
Loans 90 Days or More Past Due And Still Accruing Pending Refinancing	$ 1,398		$ 190
One To Four Family Residential And Cooperative Unit Allowance [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	300		336
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	155		155
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0		0
Non-accrual	1,136	[1]	938	[2]
Financing Receivable, Recorded Investment, Past Due, Total	1,591		1,429
Financing Receivable, Recorded Investment, Current	76,913		90,447
Loans and Leases Receivable, Other, Net of Deferred Income	78,504		91,876
Multifamily Residential and Residential Mixed Use [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	2,152		6,451
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	0		0
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	1,398		190
Non-accrual	1,993	[1]	507	[2]
Financing Receivable, Recorded Investment, Past Due, Total	5,543		7,148
Financing Receivable, Recorded Investment, Current	2,859,281		2,669,221
Loans and Leases Receivable, Other, Net of Deferred Income	2,864,824		2,676,369
Mixed Use Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	0		0
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	0		0
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0		0
Non-accrual	0	[1]	1,170	[2]
Financing Receivable, Recorded Investment, Past Due, Total	0		1,170
Financing Receivable, Recorded Investment, Current	335,650		338,963
Loans and Leases Receivable, Other, Net of Deferred Income	335,650		340,133
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	1,154		207
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	0		0
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0		0
Non-accrual	5,707	[1]	6,265	[2]
Financing Receivable, Recorded Investment, Past Due, Total	6,861		6,472
Financing Receivable, Recorded Investment, Current	380,801		388,059
Loans and Leases Receivable, Other, Net of Deferred Income	387,662		394,531
Construction Loan Receivable [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	0		0
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	0		0
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0		0
Non-accrual	0	[1]	0	[2]
Financing Receivable, Recorded Investment, Past Due, Total	0		0
Financing Receivable, Recorded Investment, Current	299		476
Loans and Leases Receivable, Other, Net of Deferred Income	299		476
Consumer Loan [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	1		2
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	1		5
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0		0
Non-accrual	2	[1]	8	[2]
Financing Receivable, Recorded Investment, Past Due, Total	4		15
Financing Receivable, Recorded Investment, Current	2,105		2,408
Loans and Leases Receivable, Other, Net of Deferred Income	2,109		2,423
Total Real Estate Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	3,606		6,994
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	155		155
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	1,398		190
Non-accrual	8,836	[1]	8,880	[2]
Financing Receivable, Recorded Investment, Past Due, Total	13,995		16,219
Financing Receivable, Recorded Investment, Current	3,652,944		3,487,166
Loans and Leases Receivable, Other, Net of Deferred Income	$ 3,666,939		$ 3,503,385

[1] Includes all loans on non-accrual status regardless of the number of days such loans were delinquent as of September 30, 2013.

[2] Includes all loans on non-accrual status regardless of the number of days such loans were delinquent as of December 31, 2012.