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Derivative and Hedging Activities - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Mar. 31, 2019 | Dec. 31, 2018
Interest Income (Expense), Net |  | $ 235,915 | $ 249,506 | $ 714,930 | $ 783,759 |  |
Derivative Liability |  |  |  |  |  |  | $ 0
Designated as Hedging Instrument [Member] |  |  |  |  |  |  |
Derivative, Notional Amount |  | 2,000,000 |  | 2,000,000 |  | $ 2,000,000 |
Interest Income (Expense), Net |  | 1,100 |  | 684,000 |  |  |
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] |  |  |  |  |  |  |
Derivative, Notional Amount |  | 2,000,000 |  | 2,000,000 |  |  |
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Other Assets [Member] |  |  |  |  |  |  |
Derivatives |  | 0 |  | 0 |  |  |
Loans and leases |  |  |  |  |  |  |
Amortized Cost |  | 4,600,000 |  | 4,600,000 |  |  |
Cumulative Amount of Fair Value Hedging Adjustments Included in the Carrying Amount of the Hedged Assets | [1] | 48,338 |  | 48,338 |  |  |
Carrying Amount of the Hedged Assets | [1] | $ 2,048,338 |  | $ 2,048,338 |  |  |
[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 September 30, 2019, the amortized cost basis of the closed portfolios used in these hedging relationships was $4.6 billion; the cumulative basis adjustments associated with these hedging relationships was $48.3 million; and the amount of the designated hedged items was $2.0 billion.

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