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ALLOWANCE FOR LOAN LOSSES, Allowance by Class of Loan (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]          
Allocated reserves related to TDRs $ 0   $ 0   $ 0
Loans classified as Substandard analysis of historical losses period     48 months   12 months
Loans classified as Special Mention analysis of historical losses period     48 months   12 months
Allowance for credit losses [Roll Forward]          
Provision (credit) for loan losses 23 $ 1,168 $ 1,520 $ 1,589  
Unfunded Loan Commitment [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Allocated reserves related to TDRs 25,000   25,000   $ 25,000
Real Estate Loans [Member]          
Allowance for credit losses [Roll Forward]          
Beginning balance 20,945 18,889 20,516 18,494 18,494
Provision (credit) for loan losses (622) 1,166 (150) 1,588  
Charge-offs (14) (26) (119) (115)  
Recoveries 13 0 75 62  
Ending balance 20,322 20,029 20,322 20,029 20,516
Allowance for loan losses [Abstract]          
Individually evaluated for impairment 0   0   0
Collectively evaluated for impairment 20,322   20,322   20,516
Loans [Abstract]          
Individually evaluated for impairment 8,630   8,630   11,913
Collectively evaluated for impairment 5,857,937   5,857,937   5,621,094
Total ending allowance balance 5,866,567   5,866,567   5,633,007
Real Estate Loans [Member] | One- to Four-Family Residential, Including Condominium and Cooperative Apartment [Member]          
Allowance for credit losses [Roll Forward]          
Beginning balance 122 192 145 263 263
Provision (credit) for loan losses (7) (48) (30) (94)  
Charge-offs (2) (4) (15) (31)  
Recoveries 2 0 15 2  
Ending balance 115 140 115 140 145
Allowance for loan losses [Abstract]          
Individually evaluated for impairment 0   0   0
Collectively evaluated for impairment 115   115   145
Loans [Abstract]          
Individually evaluated for impairment 395   395   407
Collectively evaluated for impairment 66,124   66,124   73,615
Total ending allowance balance 66,519   66,519   74,022
Real Estate Loans [Member] | Multifamily Residential and Residential Mixed Use [Member]          
Allowance for credit losses [Roll Forward]          
Beginning balance 17,372 14,826 16,555 14,118 14,118
Provision (credit) for loan losses (709) 1,293 155 2,024  
Charge-offs (12) (14) (104) (74)  
Recoveries 11 0 56 37  
Ending balance 16,662 16,105 16,662 16,105 16,555
Allowance for loan losses [Abstract]          
Individually evaluated for impairment 0   0   0
Collectively evaluated for impairment 16,662   16,662   16,555
Loans [Abstract]          
Individually evaluated for impairment 629   629   3,333
Collectively evaluated for impairment 4,786,662   4,786,662   4,597,193
Total ending allowance balance 4,787,291   4,787,291   4,600,526
Real Estate Loans [Member] | Commercial Mixed Use Real Estate [Member]          
Allowance for credit losses [Roll Forward]          
Beginning balance 1,411 1,684 1,698 1,652 1,652
Provision (credit) for loan losses 37 36 (254) 70  
Charge-offs 0 (8) 0 (10)  
Recoveries 0 0 4 0  
Ending balance 1,448 1,712 1,448 1,712 1,698
Allowance for loan losses [Abstract]          
Individually evaluated for impairment 0   0   0
Collectively evaluated for impairment 1,448   1,448   1,698
Loans [Abstract]          
Individually evaluated for impairment 4,293   4,293   4,810
Collectively evaluated for impairment 411,006   411,006   399,329
Total ending allowance balance 415,299   415,299   404,139
Real Estate Loans [Member] | Commercial Real Estate [Member]          
Allowance for credit losses [Roll Forward]          
Beginning balance 2,034 2,187 2,118 2,461 2,461
Provision (credit) for loan losses 49 (115) (35) (412)  
Charge-offs 0 0 0 0  
Recoveries 0 0 0 23  
Ending balance 2,083 2,072 2,083 2,072 2,118
Allowance for loan losses [Abstract]          
Individually evaluated for impairment 0   0   0
Collectively evaluated for impairment 2,083   2,083   2,118
Loans [Abstract]          
Individually evaluated for impairment 3,313   3,313   3,363
Collectively evaluated for impairment 585,030   585,030   550,957
Total ending allowance balance 588,343   588,343   554,320
Real Estate Loans [Member] | ADC [Member]          
Allowance for credit losses [Roll Forward]          
Beginning balance 6   0    
Provision (credit) for loan losses 8   14    
Charge-offs 0   0    
Recoveries 0   0    
Ending balance 14   14   0
Allowance for loan losses [Abstract]          
Individually evaluated for impairment 0   0    
Collectively evaluated for impairment 14   14    
Loans [Abstract]          
Individually evaluated for impairment 0   0    
Collectively evaluated for impairment 9,115   9,115    
Total ending allowance balance 9,115   9,115    
C & I [Member]          
Allowance for credit losses [Roll Forward]          
Beginning balance 1,023   0    
Provision (credit) for loan losses 643   1,666    
Charge-offs 0   0    
Recoveries 0   0    
Ending balance 1,666   1,666   0
Allowance for loan losses [Abstract]          
Individually evaluated for impairment 0   0   0
Collectively evaluated for impairment 1,666   1,666   0
Loans [Abstract]          
Individually evaluated for impairment 0   0   0
Collectively evaluated for impairment 111,099   111,099   2,058
Total ending allowance balance 111,099   111,099   2,058
Consumer Loans [Member]          
Allowance for credit losses [Roll Forward]          
Beginning balance 17 20 20 20 20
Provision (credit) for loan losses 2 2 4 1  
Charge-offs 0 (2) (5) (2)  
Recoveries 0 0 0 1  
Ending balance 19 $ 20 19 $ 20 20
Allowance for loan losses [Abstract]          
Individually evaluated for impairment 0   0   0
Collectively evaluated for impairment 19   19   20
Loans [Abstract]          
Individually evaluated for impairment 0   0   0
Collectively evaluated for impairment 1,092   1,092   1,357
Total ending allowance balance $ 1,092   $ 1,092   $ 1,357