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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 | 12 Months Ended
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Mar. 31, 2016 | Dec. 31, 2015
Interest Rate Contract [Member] | Other Non-Interest Income [Member] |  |
Other Non Interest Income Non Hedging Interest Rate Derivatives [Line Items] |  |
Amount of gain (loss) included in income (expense) | $ 435 | $ 1,322
Interest Rate Contract [Member] | Other Non-Interest Expense [Member] |  |
Other Non Interest Income Non Hedging Interest Rate Derivatives [Line Items] |  |
Amount of gain (loss) included in income (expense) | 0 | 2
Commodity Contract [Member] | Other Non-Interest Income [Member] |  |
Other Non Interest Income Non Hedging Interest Rate Derivatives [Line Items] |  |
Amount of gain (loss) included in income (expense) | 132 | 28
Foreign Currency Derivative Contracts [Member] | Other Non-Interest Income [Member] |  |
Other Non Interest Income Non Hedging Interest Rate Derivatives [Line Items] |  |
Amount of gain (loss) included in income (expense) | $ 6 | $ 45

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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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