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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 9 Months Ended 12 Months Ended
Sep. 30, 2017
USD ($)
DerivativeInstrument
Sep. 30, 2017
USD ($)
DerivativeInstrument
Dec. 31, 2016
USD ($)
DerivativeInstrument
Fair Value of Derivative Financial Instruments [Abstract]      
Weighted average pay rates 1.46% 1.46% 1.24%
Weighted average receive rates 1.32% 1.32% 0.95%
Weighted average maturity   4 years 6 months 14 days 5 years 3 months 25 days
Interest Rate Products [Member]      
Fair Value of Derivative Financial Instruments [Abstract]      
Hedge ineffectiveness $ 0 $ 0  
Estimated reclassification increase to interest expense during next twelve months $ 107 $ 107  
Interest Rate Swaps Related to FHLBNY Advances [Member]      
Fair Value of Derivative Financial Instruments [Abstract]      
Count | DerivativeInstrument 7 7 4
Notional amount $ 135,000 $ 135,000 $ 90,000
Fair value assets 2,973 2,973 3,228
Fair value liabilities $ (50) $ (50) $ 0