COMMITMENTS AND CONTINGENCIES - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Loss Contingencies [Line Items]
Securities held to maturity, mortgage-related securities, pledged	$ 3,000,000,000	$ 3,000,000,000
Securities held to maturity, other securities, pledged	617,800,000	923,500,000
Securities available for sale, mortgage-related securities, pledged	158,000,000	437,500,000
Securities available for sale, other securities, pledged	432,500,000	63,300,000
Commitments	2,915,630,000
Rental expense under non-cancelable operating lease and license agreements	28,100,000	34,000,000	26,300,000
Rental income on bank-owned properties, netted in occupancy and equipment expense	3,800,000	2,700,000	2,600,000
Minimum future rental income under non-cancelable sublease agreements	126,000
Bankers' acceptances outstanding	29,000
Total loans
Loss Contingencies [Line Items]
Commitments	2,742,742,000	1,700,000,000
Visa Litigation
Loss Contingencies [Line Items]
Fair value of contingent obligation to Visa U.S.A., based on percentage of membership interest	$ 1,700,000