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	Dec. 31, 2013		Dec. 31, 2012
Derivative [Line Items]
Net Exposure Derivative Instruments	$ 108,021	[1]	$ 78,719	[1]
Fair value	113,101		84,829
Collateral	5,080	[2]	6,110	[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	6,492		9,005
Collateral	5,080	[2]	6,110	[2]
Net Exposure	1,412	[1]	2,895	[1]
Derivatives not designated as hedging instruments | Currency exchange risks
Derivative [Line Items]
Fair value	789		(1,240)
Net Exposure Derivative Instruments	789	[1]	(1,240)	[1]
Collateral	0	[2]	0	[2]
Derivatives not designated as hedging instruments | Currency exchange risks | Foreign exchange forwards | Other assets
Derivative [Line Items]
Notional or Contractual Amount	140,760		51,010
Fair value	1,423		488
Collateral	0	[2]	0	[2]
Net Exposure	1,423	[1]	488	[1]
Derivatives not designated as hedging instruments | Currency exchange risks | Foreign exchange forwards | Other liability
Derivative [Line Items]
Notional or Contractual Amount	62,649		102,956
Fair value	(634)		(1,728)
Net Exposure Derivative Instruments Liablities	(634)	[1]	(1,728)	[1]
Collateral	0	[2]	0	[2]
Derivatives not designated as hedging instruments | Other derivative instruments | Equity Warrant Asset, Public Portfolio | Other assets
Derivative [Line Items]
Notional or Contractual Amount	179,934		164,332
Fair value	103,513		74,272
Collateral	0	[2]	0	[2]
Net Exposure	103,513	[1]	74,272	[1]
Derivatives not designated as hedging instruments | Other derivative instruments | Other derivatives
Derivative [Line Items]
Fair value	2,307		2,792
Net Exposure Derivative Instruments	2,307	[1]	2,792	[1]
Collateral	0	[2]	0	[2]
Derivatives not designated as hedging instruments | Other derivative instruments | Other derivatives | Foreign exchange forwards | Other assets
Derivative [Line Items]
Notional or Contractual Amount	424,983		385,470
Fair value	13,673		11,864
Collateral	0	[2]	0	[2]
Net Exposure	13,673	[1]	11,864	[1]
Derivatives not designated as hedging instruments | Other derivative instruments | Other derivatives | Foreign exchange forwards | Other liability
Derivative [Line Items]
Notional or Contractual Amount	367,079		356,026
Fair value	(11,549)		(9,930)
Net Exposure Derivative Instruments Liablities	(11,549)	[1]	(9,930)	[1]
Collateral	0	[2]	0	[2]
Derivatives not designated as hedging instruments | Other derivative instruments | Other derivatives | Foreign currency options | Other assets
Derivative [Line Items]
Notional or Contractual Amount	91,854		132,237
Fair value	434		1,189
Collateral	0	[2]	0	[2]
Net Exposure	434	[1]	1,189	[1]
Derivatives not designated as hedging instruments | Other derivative instruments | Other derivatives | Foreign currency options | Other liability
Derivative [Line Items]
Notional or Contractual Amount	91,854		132,237
Fair value	(434)		(1,189)
Net Exposure Derivative Instruments Liablities	(434)	[1]	(1,189)	[1]
Collateral	0	[2]	0	[2]
Derivatives not designated as hedging instruments | Other derivative instruments | Other derivatives | Loan conversion options | Other assets
Derivative [Line Items]
Notional or Contractual Amount	3,455		9,782
Fair value	314		890
Collateral	0	[2]	0	[2]
Net Exposure	314	[1]	890	[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	216,773		144,950
Fair value	1,265		558
Collateral	0	[2]	0	[2]
Net Exposure	1,265	[1]	558	[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	216,773		144,950
Fair value	(1,396)		(590)
Net Exposure Derivative Instruments Liablities	(1,396)	[1]	(590)	[1]
Collateral	$ 0	[2]	$ 0	[2]

[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 December 31, 2013 remain at investment grade or higher and there were no material changes in their credit ratings for the year ended December 31, 2013

[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.