FEDERAL HOME LOAN BANK ADVANCES (Details 2) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
FEDERAL HOME LOAN BANK ADVANCES
Available borrowing capacity from unused FHLB advances	$ 3,250,000,000	$ 3,610,000,000
Long-term FHLB advances prepaid	93,000,000	523,500,000
Additional prepayment penalties	6,800,000	11,800,000
Additional available borrowing capacity from the Federal Reserve Bank's discount window	1,310,000,000	1,020,000,000
FHLB advances	375,000,000
Modification Cost	$ 48,190,000