LOANS, Credit Quality Indicator (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
One-to four Family Residential and Cooperative Unit [Member]
Financing Receivable, Recorded Investment [Line Items]
Real estate loans not individually assigned a credit rating	$ 11,370	[1]	$ 16,141	[1]
Financing Receivable, Net	73,956		91,876
Multifamily Residential and Residential Mixed Use [Member]
Financing Receivable, Recorded Investment [Line Items]
Real estate loans not individually assigned a credit rating	0	[1]	0	[1]
Financing Receivable, Net	2,922,550		2,676,369
Mixed Use Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Real estate loans not individually assigned a credit rating	0	[1]	0	[1]
Financing Receivable, Net	375,910		340,133
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Real estate loans not individually assigned a credit rating	0	[1]	0	[1]
Financing Receivable, Net	324,696		394,531
Construction Loan Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Real estate loans not individually assigned a credit rating	0	[1]	0	[1]
Financing Receivable, Net	268		476
Total Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Real estate loans not individually assigned a credit rating	11,370	[1]	16,141	[1]
Financing Receivable, Net	3,697,380		3,503,385
Consumer Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	2,139		2,423
Pass [Member] | One-to four Family Residential and Cooperative Unit [Member]
Financing Receivable, Recorded Investment [Line Items]
Total real estate loans individually assigned a credit rating	53,472		66,415
Pass [Member] | Multifamily Residential and Residential Mixed Use [Member]
Financing Receivable, Recorded Investment [Line Items]
Total real estate loans individually assigned a credit rating	2,900,979		2,665,410
Pass [Member] | Mixed Use Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total real estate loans individually assigned a credit rating	364,808		326,053
Pass [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total real estate loans individually assigned a credit rating	299,122		363,299
Pass [Member] | Construction Loan Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Total real estate loans individually assigned a credit rating	0		0
Pass [Member] | Total Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total real estate loans individually assigned a credit rating	3,618,381		3,421,177
Special Mention [Member] | One-to four Family Residential and Cooperative Unit [Member]
Financing Receivable, Recorded Investment [Line Items]
Total real estate loans individually assigned a credit rating	6,651		6,333
Special Mention [Member] | Multifamily Residential and Residential Mixed Use [Member]
Financing Receivable, Recorded Investment [Line Items]
Total real estate loans individually assigned a credit rating	17,938		7,711
Special Mention [Member] | Mixed Use Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total real estate loans individually assigned a credit rating	5,203		5,547
Special Mention [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total real estate loans individually assigned a credit rating	4,420		2,639
Special Mention [Member] | Construction Loan Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Total real estate loans individually assigned a credit rating	0		0
Special Mention [Member] | Total Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total real estate loans individually assigned a credit rating	34,212		22,230
Substandard [Member] | One-to four Family Residential and Cooperative Unit [Member]
Financing Receivable, Recorded Investment [Line Items]
Total real estate loans individually assigned a credit rating	2,463		2,987
Substandard [Member] | Multifamily Residential and Residential Mixed Use [Member]
Financing Receivable, Recorded Investment [Line Items]
Total real estate loans individually assigned a credit rating	3,633		3,248
Substandard [Member] | Mixed Use Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total real estate loans individually assigned a credit rating	4,579		8,533
Substandard [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total real estate loans individually assigned a credit rating	21,154		28,593
Substandard [Member] | Construction Loan Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Total real estate loans individually assigned a credit rating	268		476
Substandard [Member] | Total Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total real estate loans individually assigned a credit rating	32,097		43,837
Doubtful [Member] | One-to four Family Residential and Cooperative Unit [Member]
Financing Receivable, Recorded Investment [Line Items]
Total real estate loans individually assigned a credit rating	0
Doubtful [Member] | Multifamily Residential and Residential Mixed Use [Member]
Financing Receivable, Recorded Investment [Line Items]
Total real estate loans individually assigned a credit rating	0
Doubtful [Member] | Mixed Use Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total real estate loans individually assigned a credit rating	1,320
Doubtful [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total real estate loans individually assigned a credit rating	0
Doubtful [Member] | Construction Loan Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Total real estate loans individually assigned a credit rating	0
Doubtful [Member] | Total Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total real estate loans individually assigned a credit rating	1,320
Consumer Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	2,139		2,423
Consumer Loans [Member] | Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	2,136		2,415
Consumer Loans [Member] | Non-accrual Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	$ 3		$ 8

[1] Amount comprised of fully performing one- to four-family residential and condominium or cooperative apartment loans with balances equal to or less than the FNMA Limits.