BORROWINGS (Advances from the FHLB) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank of New York advances	$ 185,000	$ 42,198
Maturing in 2019, fixed rate at rates from 2.47% to 2.73%, weighted averaging 2.64%
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank of New York advances	$ 185,000
Matured in 2018, fixed rate at rates from 1.21% to 3.23%, weighted averaging 1.53%
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank of New York advances		$ 42,198