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Derivative Instruments and Hedging Activities - Additional Information (Detail) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 USD ($) derivative swap | Dec. 31, 2017 USD ($) derivative swap
Derivative Instruments, Gain (Loss) [Line Items] |  |
Reclassification adjustment from accumulated other comprehensive income | $ (0.8) |
Period for hedging exposure to the variability in future cash flows for forecasted transactions | 27 months |
Assets needed for immediate settlement of derivatives in a net liability position | $ 0.2 |
Minimum collateral with counterparties | $ 0.4 |
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 | $ 3.6 | $ 2.7
Interest Rate Swaps | Derivative Designated as Cash Flow Hedges | Cash Flow Hedges |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Number of outstanding interest rate derivatives (derivative) | derivative | 11 | 9
Aggregate notional amount | $ 960.0 | $ 550.0
Interest Rate Swaps | Not Designated as Hedging Instrument |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Aggregate notional amount | $ 813.7 | $ 800.5
Number of interest rate swaps (swap) | swap | 84 | 76
Credit Contract | Not Designated as Hedging Instrument |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Aggregate notional amount | $ 80.0 | $ 80.5

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- Definition Period for Hedging Exposure to the Variability in Future Cash Flows for Forecasted Transactions + References No definition available. + Details
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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 The aggregate fair value of assets needed to immediately settle the derivative instruments with credit-risk-related contingent features if the credit-risk-related contingent features were triggered at the end of the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624258-113959 + Details
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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624258-113959 + 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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- Definition Number of interest rate derivative instruments held by the entity at the reporting date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5579245-113959 + Details
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