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Derivative Instruments and Hedging Activities - Additional Information (Detail) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 USD ($) derivative swap | Sep. 30, 2018 USD ($) derivative swap | Dec. 31, 2017 USD ($) derivative swap
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Reclassification adjustment from accumulated other comprehensive income |  | $ (1.0) |
Length of hedging exposure to variability in future cash flows (months) |  | 33 months |
Minimum |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative expiration period |  | 30 days |
Maximum |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative expiration period |  | 60 days |
Not Designated as Hedging Instrument | Residential mortgage loan commitments |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Aggregate notional amount | $ 6.1 | $ 6.1 | $ 2.7
Interest Rate Swaps |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Aggregate notional amount | 500.0 | 500.0 |
Interest Rate Swaps | Derivative Designated as Cash Flow Hedges | Cash Flow Hedges |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Aggregate notional amount | $ 800.0 | $ 800.0 | $ 550.0
Number of outstanding interest rate derivatives (derivative) | derivative | 8 | 8 | 9
Interest Rate Swaps | Not Designated as Hedging Instrument |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Aggregate notional amount | $ 956.8 | $ 956.8 | $ 800.5
Number of interest rate swaps (swap) | swap | 98 | 98 | 76
Credit Contract | Not Designated as Hedging Instrument |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Aggregate notional amount | $ 95.5 | $ 95.5 | $ 80.5
Other Non-interest Income | Interest Rate Swaps | Not Designated as Hedging Instrument |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain on cash flow hedge ineffectiveness | $ 2.8 |  |

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- 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 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The estimated value of gains (losses), net anticipated to be transferred in the future from accumulated other comprehensive income into earnings. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=112277219&loc=d3e80845-113994 + Details
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- Definition Period remaining until the derivative contract matures, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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