DERIVATIVE FINANCIAL INSTRUMENTS (Details 2) (USD $)	12 Months Ended
	Dec. 31, 2012 item	Dec. 31, 2011 item
Derivative
Number of hedged certificates of deposit		4
Amount of each individual certificate of deposit hedged by a derivative		$ 50,000,000
Receive-fixed, Pay-variable Interest Rate Swaps
Derivative
Number of instruments entered into during the period	2	4
Notional amount of each individual derivative entered into during the period		50,000,000
Net loss recognized in expense related to hedge ineffectiveness	3,600,000	891,000
Net reduction to interest expense related to net settlements of derivatives	3,700,000	2,500,000
Receive-fixed, Pay-variable Interest Rate Swaps, Swap One
Derivative
Notional amount of each individual derivative entered into during the period	30,000,000
Amount of each individual certificate of deposit hedged by a derivative	30,000,000
Receive-fixed, Pay-variable Interest Rate Swaps, Swap Two
Derivative
Notional amount of each individual derivative entered into during the period	20,000,000
Amount of each individual certificate of deposit hedged by a derivative	20,000,000
Equity swap agreements
Derivative
Number of instruments entered into during the period	2
Term of contract	5 years
Foreign exchange options
Derivative
Term of contract	5 years
Collateral delivered by the entity in the form of securities to counterparty institutions	940,000	636,000
Interest rate swaps
Derivative
Notional amount of derivatives called by the counterparties	200,000,000	50,000,000
Collateral delivered by the entity in the form of securities to counterparty institutions	$ 44,800,000	$ 23,500,000