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Derivative Instruments and Hedging Activities - Effect of Derivative Instruments on Comprehensive Income (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Not Designated as Hedging Instrument |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of income (loss) recognized in earnings | $ 790 | $ 3,118 | $ 1,876
Not Designated as Hedging Instrument | Other non-interest income | Interest Rate Swap |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of income (loss) recognized in earnings | 604 | 2,955 | 1,889
Not Designated as Hedging Instrument | Other non-interest income | Credit contracts |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of income (loss) recognized in earnings | 171 | 163 | (15)
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 | 15 | 0 | 2
Designated as Hedging Instrument | Interest Rate Swap | Cash Flow Hedging |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of gain (loss) recognized in OCI on derivatives (effective portion) | 406 | (629) | (1,534)
Designated as Hedging Instrument | Interest expense | Interest Rate Swap | Cash Flow Hedging |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of gain (loss) reclassified from accumulated OCI into income (effective portion) | $ (2,634) | $ (1,946) | $ 0

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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 The effective portion of net gain (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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624177-113959 + 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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