Total Notional or Contractual Amounts, Fair Value, Collateral and Net Exposure of Derivative Financial Instruments (Detail) (USD $) In Thousands	Sep. 30, 2011		Dec. 31, 2010
Derivative [Line Items]
Fair Value	$ 75,648		$ 104,955
Collateral			37,245	[1]
Net Exposure	75,648	[2]	67,710	[2]
Interest rate swaps | Derivatives designated as hedging instruments | Interest rate risks | Other assets
Derivative [Line Items]
Notional or Contractual Amount	187,393		500,000
Fair value	13,305		52,017
Collateral			37,245	[1]
Net Exposure	13,305	[2]	14,772	[2]
Derivatives not designated as hedging instruments | Currency exchange risks
Derivative [Line Items]
Fair Value	1,186		179
Net Exposure	1,186	[2]	179	[2]
Derivatives not designated as hedging instruments | Currency exchange risks | Foreign exchange forwards | Other assets
Derivative [Line Items]
Notional or Contractual Amount	65,399		33,046
Fair value	1,341		459
Net Exposure	1,341	[2]	459	[2]
Derivatives not designated as hedging instruments | Currency exchange risks | Foreign exchange forwards | Other liability
Derivative [Line Items]
Notional or Contractual Amount	10,634		26,764
Fair Value	(155)		(280)
Net Exposure	(155)	[2]	(280)	[2]
Derivatives not designated as hedging instruments | Other derivative instruments | Other derivatives
Derivative [Line Items]
Fair Value	2,634		5,194
Net Exposure	2,634	[2]	5,194	[2]
Derivatives not designated as hedging instruments | Other derivative instruments | Other derivatives | Foreign exchange forwards | Other assets
Derivative [Line Items]
Notional or Contractual Amount	313,446		291,243
Fair value	12,188		9,408
Net Exposure	12,188	[2]	9,408	[2]
Derivatives not designated as hedging instruments | Other derivative instruments | Other derivatives | Foreign exchange forwards | Other liability
Derivative [Line Items]
Notional or Contractual Amount	295,392		267,218
Fair Value	(11,609)		(8,505)
Net Exposure	(11,609)	[2]	(8,505)	[2]
Derivatives not designated as hedging instruments | Other derivative instruments | Other derivatives | Foreign currency options | Other assets
Derivative [Line Items]
Notional or Contractual Amount	75,600		118,133
Fair value	407		1,482
Net Exposure	407	[2]	1,482	[2]
Derivatives not designated as hedging instruments | Other derivative instruments | Other derivatives | Foreign currency options | Other liability
Derivative [Line Items]
Notional or Contractual Amount	75,600		118,133
Fair Value	(407)		(1,482)
Net Exposure	(407)	[2]	(1,482)	[2]
Derivatives not designated as hedging instruments | Other derivative instruments | Other derivatives | Loan conversion options | Other assets
Derivative [Line Items]
Notional or Contractual Amount	11,000		10,175
Fair value	2,057		4,291
Net Exposure	2,057	[2]	4,291	[2]
Derivatives not designated as hedging instruments | Other derivative instruments | Other derivatives | Client interest rate derivatives | Other assets
Derivative [Line Items]
Notional or Contractual Amount	36,135
Fair value	53
Net Exposure	53	[2]
Derivatives not designated as hedging instruments | Other derivative instruments | Other derivatives | Client interest rate derivatives | Other liability
Derivative [Line Items]
Notional or Contractual Amount	36,135
Fair Value	(55)
Net Exposure	(55)	[2]
Derivatives not designated as hedging instruments | Other derivative instruments | Equity warrant assets | Other assets
Derivative [Line Items]
Notional or Contractual Amount	135,155		126,062
Fair value	58,523		47,565
Net Exposure	$ 58,523	[2]	$ 47,565	[2]

[1] Cash collateral received from counterparties for our interest rate swap agreements is recorded as a component of "short-term borrowings" on our consolidated balance sheets.

[2] Net exposure for contracts in a gain position reflects the replacement cost in the event of nonperformance by all such counterparties. The credit ratings of our institutional counterparties as of September 30, 2011 remain at investment grade or higher and there were no material changes in their credit ratings for the three and nine months ended September 30, 2011.