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Derivative Instruments And Hedging Activities - Narrative (Detail) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) derivative Swap swap | Dec. 31, 2017 USD ($) derivative Swap
Derivative Instruments, Gain (Loss) [Line Items] |  |
Reclassification from AOCI to interest expense | $ 200,000 |
Period for hedging exposure to the variability in future cash flows for forecasted transactions | 30 months |
Assets needed for immediate settlement of derivatives in a net liability position | $ 2,600,000 |
Minimum collateral with counterparties | 700,000 |
Interest rate swaps |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Derivative notional amount | $ 500,000,000 |
Interest Rate Swap |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Number of interest rate swaps | swap | 3 |
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 | 98 | 76
Derivative notional amount | $ 1,030,100,000.0 | $ 800,500,000.0
Not Designated as Hedging Instrument | Residential mortgage loan commitments |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Derivative notional amount | 3,600,000.0 | 2,700,000.0
Not Designated as Hedging Instrument | Credit contracts |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Derivative notional amount | $ 94,900,000.0 | $ 80,500,000.0
Cash Flow Hedging | Designated as Hedging Instrument |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Number of interest rate swaps | derivative |  | 9
Derivative notional amount |  | $ 550,000,000
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Number of interest rate swaps | derivative | 6 | 9
Derivative notional amount | $ 750,000,000 | $ 550,000,000
Other Non-interest Income | Not Designated as Hedging Instrument | Interest rate swaps |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain on cash flow hedge ineffectiveness | $ 4,800,000 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624258-113959 + Details
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