INVESTMENT SECURITIES (Details 2) (USD $)	Sep. 30, 2012	Dec. 31, 2011
Amortized Cost
Due in one year or less	$ 11,718,000
Due after one year through five years	3,206,000
Due after five years through ten years	32,306,000
Due after ten years	1,240,990,000
Total securities available-for-sale	1,288,220,000	1,287,042,000
Carrying Value
Due in one year or less	15,381,000
Due after one year through five years	3,349,000
Due after five years through ten years	34,422,000
Due after ten years	1,304,059,000
Carrying Value	1,357,211,000	1,326,358,000
Estimated fair value of available-for-sale securities pledged as collateral	$ 116,100,000