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ALLOWANCE FOR LOAN LOSSES, Impaired Real Estate Loans (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Unpaid Principal Balance [Abstract]      
With no related allowance recorded $ 8,204 $ 11,913  
Recorded Investment [Abstract]      
With no related allowance recorded [1] 8,204 11,913  
Average Recorded Investment [Abstract]      
With no related allowance recorded [1] 10,362 10,863 $ 11,545
With related allowance recorded [1] 0 0 1,100
Total [1] 10,362 10,863 12,645
Interest Income Recognized [Abstract]      
With no related allowance recorded 422 548 431
With related allowance recorded 0 0 97
Total 422 548 528
Real Estate Loans [Member]      
Related Allowance [Abstract]      
Related allowance 0 0  
Real Estate Loans [Member] | One- to Four-Family Residential, Including Condominium and Cooperative Apartment [Member]      
Unpaid Principal Balance [Abstract]      
With no related allowance recorded 22 407  
Recorded Investment [Abstract]      
With no related allowance recorded [1] 22 407  
Related Allowance [Abstract]      
Related allowance 0 0  
Average Recorded Investment [Abstract]      
With no related allowance recorded [1] 325 443 601
With related allowance recorded [1] 0 0 0
Interest Income Recognized [Abstract]      
With no related allowance recorded 30 53 44
With related allowance recorded 0 0 0
Real Estate Loans [Member] | Multifamily Residential and Residential Mixed Use [Member]      
Unpaid Principal Balance [Abstract]      
With no related allowance recorded 619 3,333  
Recorded Investment [Abstract]      
With no related allowance recorded [1] 619 3,333  
Related Allowance [Abstract]      
Related allowance 0 0  
Average Recorded Investment [Abstract]      
With no related allowance recorded [1] 2,222 2,515 1,095
With related allowance recorded [1] 0 0 0
Interest Income Recognized [Abstract]      
With no related allowance recorded 85 183 71
With related allowance recorded 0 0 0
Real Estate Loans [Member] | Commercial Mixed Use Real Estate [Member]      
Unpaid Principal Balance [Abstract]      
With no related allowance recorded 4,267 4,810  
Recorded Investment [Abstract]      
With no related allowance recorded [1] 4,267 4,810  
Related Allowance [Abstract]      
Related allowance 0 0  
Average Recorded Investment [Abstract]      
With no related allowance recorded [1] 4,485 4,468 4,379
With related allowance recorded [1] 0 0 0
Interest Income Recognized [Abstract]      
With no related allowance recorded 174 176 176
With related allowance recorded 0 0 0
Real Estate Loans [Member] | Commercial Real Estate [Member]      
Unpaid Principal Balance [Abstract]      
With no related allowance recorded 3,296 3,363  
Recorded Investment [Abstract]      
With no related allowance recorded [1] 3,296 3,363  
Related Allowance [Abstract]      
Related allowance 0 0  
Average Recorded Investment [Abstract]      
With no related allowance recorded [1] 3,330 3,437 5,470
With related allowance recorded [1] 0 0 1,100
Interest Income Recognized [Abstract]      
With no related allowance recorded 133 136 140
With related allowance recorded $ 0 $ 0 $ 97
[1] The recorded investment excludes accrued interest receivable and loan origination fees, net, due to immateriality.