DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES (Details 3) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Offsetting of Financial Liabilities and Derivative Liabilities
Net Amounts of Liabilities Presented in the Statements of Condition	$ (18,259,000)	$ (11,964,000)
Interest rate swaps
Interest Rate Swap Agreements ("Swap Agreements")
Amount of collateral posted for the net liability positions	18,200,000	11,200,000
Offsetting of Financial Liabilities and Derivative Liabilities
Gross Amounts of Recognized Liabilities	(18,282,000)	(13,877,000)
Gross Amounts Offset in the Statements of Condition	58,000	1,913,000
Net Amounts of Liabilities Presented in the Statements of Condition	(18,224,000)	(11,964,000)
Gross Amounts Not Offset in the Statements of Condition
Financial instruments	14,984,000	9,544,000
Securities and Cash Collateral Pledged	3,190,000	1,700,000
Net Amount	(50,000)	(720,000)
Institutional counterparties | Interest rate swaps
Offsetting of Financial Liabilities and Derivative Liabilities
Gross Amounts of Recognized Liabilities	(18,232,000)	(13,157,000)
Gross Amounts Offset in the Statements of Condition	58,000	1,913,000
Net Amounts of Liabilities Presented in the Statements of Condition	(18,174,000)	(11,244,000)
Gross Amounts Not Offset in the Statements of Condition
Financial instruments	14,984,000	9,544,000
Securities and Cash Collateral Pledged	3,190,000	1,700,000
Commercial counterparties | Interest rate swaps
Offsetting of Financial Liabilities and Derivative Liabilities
Gross Amounts of Recognized Liabilities	(50,000)	(720,000)
Net Amounts of Liabilities Presented in the Statements of Condition	(50,000)	(720,000)
Gross Amounts Not Offset in the Statements of Condition
Net Amount	$ (50,000)	$ (720,000)