DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES (Details 2) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Offsetting of Financial Assets and Derivative Assets
Gross Amounts of Recognized Assets	$ 13,269,000	$ 14,746,000
Net Amounts of Assets Presented in the Statements of Condition	13,269,000	14,746,000
Net Amount	13,269,000	14,746,000
Offsetting of Financial Liabilities and Derivative Liabilities
Gross Amounts of Recognized Liabilities	(26,562,000)	(29,814,000)
Net Amounts of Liabilities Presented in the Statements of Condition	(26,562,000)	(29,814,000)
Gross Amounts Not Offset in the Statements of Condition
Financial instruments	22,132,000	25,384,000
Securities and Cash Collateral Pledged	4,430,000	4,430,000
Institutional counterparties
Offsetting of Financial Liabilities and Derivative Liabilities
Gross Amounts of Recognized Liabilities	(26,562,000)	(29,814,000)
Net Amounts of Liabilities Presented in the Statements of Condition	(26,562,000)	(29,814,000)
Gross Amounts Not Offset in the Statements of Condition
Financial instruments	22,132,000	25,384,000
Securities and Cash Collateral Pledged	4,430,000	4,430,000
Commercial counterparties
Offsetting of Financial Assets and Derivative Assets
Gross Amounts of Recognized Assets	13,269,000	14,746,000
Net Amounts of Assets Presented in the Statements of Condition	13,269,000	14,746,000
Net Amount	13,269,000	14,746,000
Interest Rate Swap Agreements
Assets and liabilities subject to an enforceable master netting arrangement
Amount of collateral posted for the net liability positions	$ 26,500,000	$ 29,800,000