Derivative Financial Instruments Total Notional or Contractual Amounts, Fair Value, Collateral and Net Exposure of Derivative Financial Instruments (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Derivative [Line Items]
Net Exposure Derivative Instruments	$ 142,446	$ 119,098
Fair value	144,346	126,879
Collateral	1,900	7,781
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	2,768	4,609
Collateral	0	2,970
Net Exposure	2,768	1,639
Derivatives not designated as hedging instruments | Currency exchange risks
Derivative [Line Items]
Fair value	140	4,561
Net Exposure Derivative Instruments	140	2,120
Collateral	0	2,441
Derivatives not designated as hedging instruments | Currency exchange risks | Foreign exchange forwards | Other Assets
Derivative [Line Items]
Notional or Contractual Amount	49,287	200,957
Fair value	809	5,050
Collateral	0	2,441
Net Exposure	809	2,609
Derivatives not designated as hedging instruments | Currency exchange risks | Foreign exchange forwards | Other liability
Derivative [Line Items]
Notional or Contractual Amount	6,586	6,226
Fair value	(669)	(489)
Net Exposure Derivative Instruments Liabilities	(669)	(489)
Collateral	0	0
Derivatives not designated as hedging instruments | Other derivative instruments | Equity warrant assets | Other Assets
Derivative [Line Items]
Notional or Contractual Amount	210,102	197,878
Fair value	137,105	116,604
Collateral	0	0
Net Exposure	137,105	116,604
Derivatives not designated as hedging instruments | Other derivative instruments | Other derivatives
Derivative [Line Items]
Fair value	4,333	1,105
Net Exposure Derivative Instruments	2,433	(1,265)
Collateral	1,900	2,370
Derivatives not designated as hedging instruments | Other derivative instruments | Other derivatives | Foreign exchange forwards | Other Assets
Derivative [Line Items]
Notional or Contractual Amount	935,514	801,487
Fair value	29,722	28,954
Collateral	1,900	2,370
Net Exposure	27,822	26,584
Derivatives not designated as hedging instruments | Other derivative instruments | Other derivatives | Foreign exchange forwards | Other liability
Derivative [Line Items]
Notional or Contractual Amount	841,182	774,355
Fair value	(24,978)	(27,647)
Net Exposure Derivative Instruments Liabilities	(24,978)	(27,647)
Collateral	0	0
Derivatives not designated as hedging instruments | Other derivative instruments | Other derivatives | Foreign currency options | Other Assets
Derivative [Line Items]
Notional or Contractual Amount	46,625	34,926
Fair value	706	227
Collateral	0	0
Net Exposure	706	227
Derivatives not designated as hedging instruments | Other derivative instruments | Other derivatives | Foreign currency options | Other liability
Derivative [Line Items]
Notional or Contractual Amount	46,625	34,926
Fair value	(706)	(227)
Net Exposure Derivative Instruments Liabilities	(706)	(227)
Collateral	0	0
Derivatives not designated as hedging instruments | Other derivative instruments | Other derivatives | Client interest rate derivatives | Other Assets
Derivative [Line Items]
Notional or Contractual Amount	422,741	387,410
Fair value	3,973	2,546
Collateral	0	0
Net Exposure	3,973	2,546
Derivatives not designated as hedging instruments | Other derivative instruments | Other derivatives | Client interest rate derivatives | Other liability
Derivative [Line Items]
Notional or Contractual Amount	422,741	387,410
Fair value	(4,384)	(2,748)
Net Exposure Derivative Instruments Liabilities	(4,384)	(2,748)
Collateral	$ 0	$ 0