ALLOWANCE FOR LOAN LOSSES, Impaired Real Estate Loans (Details) - Real Estate Loans [Member] - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Unpaid Principal Balance [Abstract]
With no related allowance recorded		$ 11,597		$ 11,597		$ 9,605
With related allowance recorded		0		0		0
Total		11,597		11,597		9,605
Recorded Investment [Abstract]
With no related allowance recorded	[1]	11,597		11,597		9,561
With related allowance recorded	[1]	0		0		0
Total	[1]	11,597		11,597		9,561
Related Allowance [Abstract]
Related allowance		0		0		0
Average Recorded Investment [Abstract]
With no related allowance recorded		11,847	$ 11,227	10,601	$ 12,042
With related allowance recorded		0	0	0	1,375
Total		11,847	11,227	10,601	13,417
Interest Income Recognized [Abstract]
With no related allowance recorded		182	100	418	328
With related allowance recorded		0	0	0	97
Total		182	100	418	425
One- to Four-Family Residential, Including Condominium and Cooperative Apartment [Member]
Unpaid Principal Balance [Abstract]
With no related allowance recorded		410		410		635
With related allowance recorded		0		0		0
Total		410		410		635
Recorded Investment [Abstract]
With no related allowance recorded	[1]	410		410		598
With related allowance recorded	[1]	0		0		0
Total	[1]	410		410		598
Related Allowance [Abstract]
Related allowance		0		0		0
Average Recorded Investment [Abstract]
With no related allowance recorded		412	601	452	602
With related allowance recorded		0	0	0	0
Total		412	601	452	602
Interest Income Recognized [Abstract]
With no related allowance recorded		6	11	47	34
With related allowance recorded		0	0	0	0
Total		6	11	47	34
Multifamily Residential And Residential Mixed Use Allowance [Member]
Unpaid Principal Balance [Abstract]
With no related allowance recorded		3,356		3,356		983
With related allowance recorded		0		0		0
Total		3,356		3,356		983
Recorded Investment [Abstract]
With no related allowance recorded	[1]	3,356		3,356		983
With related allowance recorded	[1]	0		0		0
Total	[1]	3,356		3,356		983
Related Allowance [Abstract]
Related allowance		0		0		0
Average Recorded Investment [Abstract]
With no related allowance recorded		3,643	1,074	2,310	1,123
With related allowance recorded		0	0	0	0
Total		3,643	1,074	2,310	1,123
Interest Income Recognized [Abstract]
With no related allowance recorded		99	10	138	56
With related allowance recorded		0	0	0	0
Total		99	10	138	56
Commercial Mixed Use Real Estate [Member]
Unpaid Principal Balance [Abstract]
With no related allowance recorded		4,451		4,451		4,345
With related allowance recorded		0		0		0
Total		4,451		4,451		4,345
Recorded Investment [Abstract]
With no related allowance recorded	[1]	4,451		4,451		4,345
With related allowance recorded	[1]	0		0		0
Total	[1]	4,451		4,451		4,345
Related Allowance [Abstract]
Related allowance		0		0		0
Average Recorded Investment [Abstract]
With no related allowance recorded		4,404	4,383	4,383	4,388
With related allowance recorded		0	0	0	0
Total		4,404	4,383	4,383	4,388
Interest Income Recognized [Abstract]
With no related allowance recorded		43	44	131	132
With related allowance recorded		0	0	0	0
Total		43	44	131	132
Commercial Real Estate [Member]
Unpaid Principal Balance [Abstract]
With no related allowance recorded		3,380		3,380		3,642
With related allowance recorded		0		0		0
Total		3,380		3,380		3,642
Recorded Investment [Abstract]
With no related allowance recorded	[1]	3,380		3,380		3,635
With related allowance recorded	[1]	0		0		0
Total	[1]	3,380		3,380		3,635
Related Allowance [Abstract]
Related allowance		0		0		$ 0
Average Recorded Investment [Abstract]
With no related allowance recorded		3,388	5,169	3,456	5,929
With related allowance recorded		0	0	0	1,375
Total		3,388	5,169	3,456	7,304
Interest Income Recognized [Abstract]
With no related allowance recorded		34	35	102	106
With related allowance recorded		0	0	0	97
Total		$ 34	$ 35	$ 102	$ 203

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