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Derivative and Hedging Activities - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended
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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.

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- Definition 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) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL109999718-113959 + Details
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- Definition Nominal or face amount used to calculate payments on the derivative asset. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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