Derivative Financial Instruments - Total Notional or Contractual Amounts, Fair Value, Collateral and Net Exposure of Derivative Financial Instruments (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013
Derivative [Line Items]
Fair Value	$ 98,415		$ 113,101
Net Exposure	93,605	[1]	108,021	[1]
Collateral	4,810	[2]	5,080	[2]
Derivatives designated as hedging instruments | Interest rate risks | Interest rate swaps | Other assets
Derivative [Line Items]
Notional or Contractual Amount	45,964		45,964
Fair Value	6,025		6,492
Net Exposure	1,215	[1]	1,412	[1]
Collateral	4,810	[2]	5,080	[2]
Derivatives not designated as hedging instruments | Currency exchange risks
Derivative [Line Items]
Fair Value	(380)		789
Net Exposure	(380)	[1]	789	[1]
Derivatives not designated as hedging instruments | Currency exchange risks | Foreign exchange forwards | Other assets
Derivative [Line Items]
Notional or Contractual Amount	7,746		140,760
Fair Value	294		1,423
Net Exposure	294	[1]	1,423	[1]
Derivatives not designated as hedging instruments | Currency exchange risks | Foreign exchange forwards | Other liability
Derivative [Line Items]
Notional or Contractual Amount	236,943		62,649
Fair Value	(674)		(634)
Net Exposure	(674)	[1]	(634)	[1]
Derivatives not designated as hedging instruments | Other derivative instruments | Equity warrant assets | Other assets
Derivative [Line Items]
Notional or Contractual Amount	180,471		179,934
Fair Value	91,135		103,513
Net Exposure	91,135	[1]	103,513	[1]
Derivatives not designated as hedging instruments | Other derivative instruments | Other derivatives
Derivative [Line Items]
Fair Value	1,635		2,307
Net Exposure	1,635	[1]	2,307	[1]
Derivatives not designated as hedging instruments | Other derivative instruments | Other derivatives | Foreign exchange forwards | Other assets
Derivative [Line Items]
Notional or Contractual Amount	376,095		424,983
Fair Value	10,881		13,673
Net Exposure	10,881	[1]	13,673	[1]
Derivatives not designated as hedging instruments | Other derivative instruments | Other derivatives | Foreign exchange forwards | Other liability
Derivative [Line Items]
Notional or Contractual Amount	346,376		367,079
Fair Value	(9,369)		(11,549)
Net Exposure	(9,369)	[1]	(11,549)	[1]
Derivatives not designated as hedging instruments | Other derivative instruments | Other derivatives | Client foreign currency options | Other assets
Derivative [Line Items]
Notional or Contractual Amount	85,977		91,854
Fair Value	213		434
Net Exposure	213	[1]	434	[1]
Derivatives not designated as hedging instruments | Other derivative instruments | Other derivatives | Client foreign currency options | Other liability
Derivative [Line Items]
Notional or Contractual Amount	85,977		91,854
Fair Value	(213)		(434)
Net Exposure	(213)	[1]	(434)	[1]
Derivatives not designated as hedging instruments | Other derivative instruments | Other derivatives | Loan conversion options | Other assets
Derivative [Line Items]
Notional or Contractual Amount	3,282		3,455
Fair Value	290		314
Net Exposure	290	[1]	314	[1]
Derivatives not designated as hedging instruments | Other derivative instruments | Other derivatives | Client interest rate derivatives | Other assets
Derivative [Line Items]
Notional or Contractual Amount	263,927		216,773
Fair Value	1,471		1,265
Net Exposure	1,471	[1]	1,265	[1]
Derivatives not designated as hedging instruments | Other derivative instruments | Other derivatives | Client interest rate derivatives | Other liability
Derivative [Line Items]
Notional or Contractual Amount	263,927		216,773
Fair Value	(1,638)		(1,396)
Net Exposure	$ (1,638)	[1]	$ (1,396)	[1]

[1] 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 March 31, 2014 remain at investment grade or higher and there were no material changes in their credit ratings during the three months ended March 31, 2014.

[2] Cash collateral received from our counterparty for our interest rate swap agreement is recorded as a component of “short-term borrowings” on our consolidated balance sheets.