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ALLOWANCE FOR LOAN LOSSES, Impaired Real Estate Loans (Details) - Real Estate Loans [Member] - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Unpaid Principal Balance [Abstract]      
With no allowance reserve $ 11,756   $ 11,913
Recorded Investment [Abstract]      
With no allowance reserve [1] 11,756   11,913
Related Allowance [Abstract]      
Related allowance 0   0
Average Recorded Investment [Abstract]      
With no allowance reserve 11,834 $ 9,353  
Interest Income Recognized [Abstract]      
With no related allowance recorded 132 125  
One- to Four-Family Residential, Including Condominium and Cooperative Apartment [Member]      
Unpaid Principal Balance [Abstract]      
With no allowance reserve 402   407
Recorded Investment [Abstract]      
With no allowance reserve [1] 402   407
Related Allowance [Abstract]      
Related allowance 0   0
Average Recorded Investment [Abstract]      
With no allowance reserve 404 491  
Interest Income Recognized [Abstract]      
With no related allowance recorded 7 35  
Multifamily Residential And Residential Mixed Use Allowance [Member]      
Unpaid Principal Balance [Abstract]      
With no allowance reserve 3,272   3,333
Recorded Investment [Abstract]      
With no allowance reserve [1] 3,272   3,333
Related Allowance [Abstract]      
Related allowance 0   0
Average Recorded Investment [Abstract]      
With no allowance reserve 3,302 978  
Interest Income Recognized [Abstract]      
With no related allowance recorded 46 12  
Commercial Mixed Use Real Estate [Member]      
Unpaid Principal Balance [Abstract]      
With no allowance reserve 4,735   4,810
Recorded Investment [Abstract]      
With no allowance reserve [1] 4,735   4,810
Related Allowance [Abstract]      
Related allowance 0   0
Average Recorded Investment [Abstract]      
With no allowance reserve 4,773 4,361  
Interest Income Recognized [Abstract]      
With no related allowance recorded 45 44  
Commercial Real Estate [Member]      
Unpaid Principal Balance [Abstract]      
With no allowance reserve 3,347   3,363
Recorded Investment [Abstract]      
With no allowance reserve [1] 3,347   3,363
Related Allowance [Abstract]      
Related allowance 0   $ 0
Average Recorded Investment [Abstract]      
With no allowance reserve 3,355 3,523  
Interest Income Recognized [Abstract]      
With no related allowance recorded $ 34 $ 34  
[1] The recorded investment excludes accrued interest receivable and loan origination fees, net, due to immateriality.