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Derivative Instruments and Hedging Activities - Amount of Gain or Loss Recognized in Income on Derivatives (Detail) - Not Designated as Hedging Instruments - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Total Derivatives Gain | $ 116 | $ 94 | $ 419 | $ 290
Interest Rate Swap Contracts - Commercial Loans |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Total Derivatives Gain | (87) | 29 | 34 | 20
Interest Rate Lock Commitments - Mortgage Loans |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Total Derivatives Gain | 97 | 208 | 478 | 339
Forward Sale Contracts - Mortgage Loans |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Total Derivatives Gain | $ 106 | $ (143) | $ (93) | $ (69)

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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=64837297&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=64837297&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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