ALLOWANCE FOR LOAN LOSSES, Impaired Real Estate Loans (Details) - Real Estate Loans [Member] - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Unpaid Principal Balance [Abstract]
With no allocated reserve		$ 12,097		$ 12,097		$ 9,605
With an allocated reserve		0		0		0
Recorded Investment [Abstract]
With no allocated reserve	[1]	12,097		12,097		9,561
With an allocated reserve	[1]	0		0		0
Reserve Balance Allocated within the Allowance for Loan Losses [Abstract]
With no allocated reserve		0		0		0
With an allocated reserve		0		0		0
Average Recorded Investment [Abstract]
With no allocated reserve		10,621	$ 11,909	10,268	$ 12,767
With an allocated reserve		0	0	0	1,833
Interest Income Recognized [Abstract]
With no allocated reserve		110	121	235	228
With an allocated reserve		0	0	0	97
One- to Four-Family Residential, Including Condominium and Cooperative Apartment [Member]
Unpaid Principal Balance [Abstract]
With no allocated reserve		414		414		635
With an allocated reserve		0		0		0
Recorded Investment [Abstract]
With no allocated reserve	[1]	414		414		598
With an allocated reserve	[1]	0		0		0
Reserve Balance Allocated within the Allowance for Loan Losses [Abstract]
With no allocated reserve		0		0		0
With an allocated reserve		0		0		0
Average Recorded Investment [Abstract]
With no allocated reserve		399	602	465	603
With an allocated reserve		0	0	0	0
Interest Income Recognized [Abstract]
With no allocated reserve		7	11	41	23
With an allocated reserve		0	0	0	0
Multifamily Residential And Residential Mixed Use Allowance [Member]
Unpaid Principal Balance [Abstract]
With no allocated reserve		3,930		3,930		983
With an allocated reserve		0		0		0
Recorded Investment [Abstract]
With no allocated reserve	[1]	3,930		3,930		983
With an allocated reserve	[1]	0		0		0
Reserve Balance Allocated within the Allowance for Loan Losses [Abstract]
With no allocated reserve		0		0		0
With an allocated reserve		0		0		0
Average Recorded Investment [Abstract]
With no allocated reserve		2,451	985	1,962	1,081
With an allocated reserve		0	0	0	0
Interest Income Recognized [Abstract]
With no allocated reserve		25	31	38	46
With an allocated reserve		0	0	0	0
Commercial Mixed Use Real Estate [Member]
Unpaid Principal Balance [Abstract]
With no allocated reserve		4,357		4,357		4,345
With an allocated reserve		0		0		0
Recorded Investment [Abstract]
With no allocated reserve	[1]	4,357		4,357		4,345
With an allocated reserve	[1]	0		0		0
Reserve Balance Allocated within the Allowance for Loan Losses [Abstract]
With no allocated reserve		0		0		0
With an allocated reserve		0		0		0
Average Recorded Investment [Abstract]
With no allocated reserve		4,367	4,393	4,360	4,395
With an allocated reserve		0	0	0	0
Interest Income Recognized [Abstract]
With no allocated reserve		44	44	88	88
With an allocated reserve		0	0	0	0
Commercial Real Estate [Member]
Unpaid Principal Balance [Abstract]
With no allocated reserve		3,396		3,396		3,642
With an allocated reserve		0		0		0
Recorded Investment [Abstract]
With no allocated reserve	[1]	3,396		3,396		3,635
With an allocated reserve	[1]	0		0		0
Reserve Balance Allocated within the Allowance for Loan Losses [Abstract]
With no allocated reserve		0		0		0
With an allocated reserve		0		0		$ 0
Average Recorded Investment [Abstract]
With no allocated reserve		3,404	5,929	3,481	6,688
With an allocated reserve		0	0	0	1,833
Interest Income Recognized [Abstract]
With no allocated reserve		34	35	68	71
With an allocated reserve		0	0	0	97
Construction [Member]
Average Recorded Investment [Abstract]
With no allocated reserve		0	0	0	0
With an allocated reserve		0	0	0	0
Interest Income Recognized [Abstract]
With no allocated reserve		0	0	0	0
With an allocated reserve		$ 0	$ 0	$ 0	$ 0

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