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Derivatives and Hedging Activities - Additional Information (Detail) | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 USD ($) Derivative | Dec. 31, 2020 USD ($) Derivative | Aug. 28, 2020 USD ($)
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Termination value of derivatives in net liability position | $ 6,000,000.0 |  |
Collateral posted for derivative instruments | $ 8,800,000 |  |
Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedging [Member] |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Interest rate hedging exposure to variability in future cash flows for forecasted transactions, maximum period | 15 years |  |
Interest Rate Swap [Member] | Derivatives Designated as Hedging Instruments [Member] | Fair Value Hedging [Member] |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Derivative, notional amount | $ 1,000,000,000.0 | $ 5,000,000.0 |
Number of interest rate swaps | Derivative | 11 | 1 |
Interest Rate Swap [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedging [Member] |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Derivative, notional amount | $ 51,500,000 | $ 51,500,000 |
Number of interest rate swaps | Derivative | 2 | 2 |
Interest Rate Swap [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedging [Member] | Interest Expense [Member] |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Reclassification from AOCI to interest | $ 1,300,000 |  |
Interest Rate Swap [Member] | Derivatives not Designated as Hedging Instruments [Member] |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Derivative, notional amount | $ 2,800,000,000 | $ 2,500,000,000 |
Number of interest rate swaps | Derivative | 192 | 176 |
Interest Rate Floor [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedging [Member] |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Derivative, notional amount |  |  | $ 750,000,000.0
Net asset fair value |  |  | $ 34,100,000
Unrealized gain on terminated interest rate floor remaining in AOCI, pre tax | $ 13,500,000 | $ 17,000,000.0 |
Unrealized gain on terminated interest rate floor remaining in AOCI, net of tax | $ 10,200,000 | $ 12,900,000 |
Unrealized gain reclassification to earnings, remaining term | 2 years 10 months 24 days |  |
Interest rate floor termination date | Aug. 28, 2020 |  |
Interest Rate Floor [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedging [Member] | Reduction To Interest Income [Member] |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Reclassification from AOCI to interest | $ 4,900,000 |  |

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- Definition The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5624258-113959 + Details
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