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DERIVATIVES AND HEDGING ACTIVITIES, Classification on Consolidated Statements of Financial Condition (Details) - Designated as Hedging Instrument [Member]
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2017
USD ($)
DerivativeInstrument
Dec. 31, 2016
USD ($)
DerivativeInstrument
Fair Value of Derivative Financial Instruments [Abstract]    
Weighted average pay rates 1.40% 1.24%
Weighted average receive rates 1.09% 0.95%
Weighted average maturity 5 years 11 days 5 years 3 months 25 days
Interest Rate Products [Member]    
Fair Value of Derivative Financial Instruments [Abstract]    
Hedge ineffectiveness $ 0  
Interest Rate Swaps Related to FHLBNY Advances [Member]    
Fair Value of Derivative Financial Instruments [Abstract]    
Count | DerivativeInstrument 6 4
Notional amount $ 115,000 $ 90,000
Fair value assets 3,576 3,228
Fair value liabilities $ 0 $ 0