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Derivative and Hedging Activities - Additional Information (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Interest Income (Expense), Net |  | $ 957,400,000 | $ 1,030,995,000 | $ 1,130,003,000
Carrying Amount of the Hedged Assets |  | 2,000,000,000.0 |  |
Gain (loss) on interest rate cash flow hedge ineffectiveness |  | 154,000 |  |
Interest rate cash flow hedge gain (loss) to be reclassified during next 12 months, net |  | 3,000,000.0 |  |
Designated as Hedging Instrument [Member] |  |  |  |
Derivative, Notional Amount |  | 2,000,000,000 | 2,000,000,000.0 |
Interest Income (Expense), Net |  | 3,400,000 |  |
Interest Rate Swap [Member] | Cash Flow Hedging [Member] |  |  |  |
Derivative, Notional Amount |  | 800,000,000 | $ 0 |
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] |  |  |  |
Derivative, Notional Amount |  | 2,000,000,000 |  |
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | LCH |  |  |  |
Derivative, Notional Amount |  | 2,800,000,000 |  |
Loans and leases |  |  |  |
Amortized Cost |  | 4,500,000,000 |  |
Cumulative Amount of Fair Value Hedging Adjustments Included in the Carrying Amount of the Hedged Assets | [1] | 53,483,000 |  |
Carrying Amount of the Hedged Assets | [1] | $ 2,053,483,000 |  |
[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 December 31, 2019, the amortized cost basis of the closed portfolios used in these hedging relationships was $0.0 billion; the cumulative basis adjustments associated with these hedging relationships was $00.0 million; and the amount of the designated hedged items was $0.0 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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