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Derivative Instruments And Hedging Activities - Narrative (Detail) | 12 Months Ended
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Dec. 31, 2017 USD ($) derivative Swap | Dec. 31, 2016 USD ($) derivative Swap | Dec. 31, 2015 USD ($)
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Reclassification from AOCI to interest expense | $ 300,000 |  |
Period for hedging exposure to the variability in future cash flows for forecasted transactions | 24 months |  |
Assets needed for immediate settlement of derivatives in a net liability position | $ 4,400,000 |  |
Minimum collateral with counterparties | $ 4,900,000 |  |
Not Designated as Hedging Instrument | Minimum |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative expiration period | 30 days |  |
Not Designated as Hedging Instrument | Maximum |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative expiration period | 60 days |  |
Not Designated as Hedging Instrument | Interest Rate Swap |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Number of interest rate swaps | Swap | 76 | 76 |
Derivative notional amount | $ 800,500,000.0 | $ 716,600,000.0 |
Not Designated as Hedging Instrument | Residential mortgage loan commitments |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative notional amount | 2,700,000.0 | 3,600,000.0 |
Not Designated as Hedging Instrument | Credit contracts |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative notional amount | $ 80,500,000.0 | $ 44,900,000.0 |
Cash Flow Hedging | Designated as Hedging Instrument |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Number of interest rate swaps | derivative |  | 4 |
Derivative notional amount |  | $ 325,000,000 |
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Number of interest rate swaps | derivative | 9 | 4 |
Derivative notional amount | $ 550,000,000 | $ 325,000,000 |
Interest expense | Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of gain (loss) reclassified from accumulated OCI into income (effective portion) | $ (2,634,000) | $ (1,946,000) | $ 0

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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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