Derivative Instruments and Hedging Activities - Gains (Losses) Related to Interest Rate Derivatives Designated as Hedges of Fair Value (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2014	Mar. 31, 2013
Gain Loss On Fair Value Hedges Recognized In Earnings [Line Items]
Interest income	$ 131,079	$ 132,999
Interest expense	(39,014)	(42,997)
Designated as Fair Value Hedge [Member] \| Derivative Interest Rate Swaps [Member]
Gain Loss On Fair Value Hedges Recognized In Earnings [Line Items]
Interest income	(23)	97
Interest expense	(3,175)	(140)
Designated as Fair Value Hedge [Member] \| Derivatives Designated as Hedging Instruments [Member]
Gain Loss On Fair Value Hedges Recognized In Earnings [Line Items]
Interest income	23	(97)
Interest expense	$ (3,144)	$ (143)

The aggregate interest and fee income generated by: (1) loans the Entity has positive intent and ability to hold for the foreseeable future, or until maturity or payoff, including commercial and consumer loans, whether domestic or foreign, which may consist of: (a) industrial and agricultural; (b) real estate; and (c) real estate construction loans; (d) trade financing; (e) lease financing; (f) home equity lines-of-credit; (g) automobile and other vehicle loans; and (h) credit card and other revolving-type loans and (2) loans and leases held-for-sale which may include mortgage loans, direct financing, and sales-type leases.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-04.1)

-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 1

-Article 9

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration