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Derivative and Hedging Activities - Additional Information (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
Interest Income (Expense), Net		$ 241,325	$ 270,298
Designated as Hedging Instrument [Member]
Derivative, Notional Amount		2,000,000
Interest Income (Expense), Net		239,000
Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivatives
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]
Derivative, Notional Amount		2,000,000
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivatives
Loans and leases
Amortized Cost		4,700,000
Cumulative Amount of Fair Value Hedging Adjustments Included in the Carrying Amount of the Hedged Assets	[1]	18,532
Carrying Amount of the Hedged Assets	[1]	$ 2,018,532
[1] These amounts include the amortized cost basis of closed portfolios used to designated hedging relationships in which the hedged item is the last layer expected to be remaining at the end of the hedging relationship. At March 31, 2019, the amortized cost basis of the closed portfolios used in these hedging relationships was $ 4.7 billion; the cumulative basis adjustments associated with these hedging relationships was $18.5 million; and the amount of the designated hedged items was $2.0 billion.

X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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Amortized cost of closed portfolio of prepayable financial asset and beneficial interest secured by prepayable financial instrument, used to designate hedging relationship in which hedged item is last layer expected to be remaining at end of hedging relationship.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4EEE
-Subparagraph (a)
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Nominal or face amount used to calculate payments on the derivative asset.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
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-Section 55
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Aggregate fair value of all derivative assets designated as hedging instruments. Includes instruments designated as cash flow hedges, fair value hedges, and hedges of net investments in foreign operations.

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The net amount of operating interest income (expense).

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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