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Derivative Financial Instruments - Schedule of Amounts Related to Non-Hedging Interest Rate and Commodity Derivatives (Detail) - Non Designated as Hedging Instrument [Member] - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Interest Rate Contract [Member] | Other Non-Interest Income [Member] |  |  |  |
Other Non Interest Income Non Hedging Interest Rate Derivatives [Line Items] |  |  |  |
Amount included in income or expense | $ 293 | $ 414 | $ 1,855 | $ 1,279
Interest Rate Contract [Member] | Other Non-Interest Expense [Member] |  |  |  |
Other Non Interest Income Non Hedging Interest Rate Derivatives [Line Items] |  |  |  |
Amount included in income or expense | (40) | (5) | (43) | (3)
Commodity Contract [Member] | Other Non-Interest Income [Member] |  |  |  |
Other Non Interest Income Non Hedging Interest Rate Derivatives [Line Items] |  |  |  |
Amount included in income or expense | 1 | 7 | 67 | 100
Foreign Currency Derivative Contracts [Member] | Other Non-Interest Income [Member] |  |  |  |
Other Non Interest Income Non Hedging Interest Rate Derivatives [Line Items] |  |  |  |
Amount included in income or expense | $ (37) | $ 43 | $ 74 | $ 118

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- Definition Other Non Interest Income Non Hedging Interest Rate Derivatives [Line Items] + References No definition available. + Details
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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=56946850&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=56946850&loc=SL5624171-113959 + Details
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