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Derivative Instruments and Hedging Activities - Effect of Derivative Financial Instruments on Comprehensive Income (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Interest Expense | Interest Rate Swaps | Cash Flow Hedges |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of Gain (Loss) Recognized in OCI on Derivatives (Effective Portion) | $ 646 | $ 201
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) | (131) | (827)
Not Designated as Hedging Instrument |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of Income (Loss) Recognized in Earnings | 385 | 533
Not Designated as Hedging Instrument | Other Non-interest Income | Interest Rate Swaps |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of Income (Loss) Recognized in Earnings | 385 | 483
Not Designated as Hedging Instrument | Other Non-interest Income | Credit Contract |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of Income (Loss) Recognized in Earnings | (23) | 0
Not Designated as Hedging Instrument | Mortgage Banking Income | Residential Mortgage Loan Commitments |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of Income (Loss) Recognized in Earnings | $ 23 | $ 50

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + 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 effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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- Definition The effective portion of loss reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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