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Derivative Instruments and Hedging Activities - Fair Value of Derivative Financial Instruments (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Interest rate swaps |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Fair value, derivative assets | $ 5,930 | $ 4,723
Fair value, derivative liabilities | 5,058 | 9,825
Designated as Hedging Instrument | Other assets |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Fair value, derivative assets | 816 | 0
Designated as Hedging Instrument | Other assets | Interest rate swaps |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Fair value, derivative assets | 816 | 0
Designated as Hedging Instrument | Other liabilities |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Fair value, derivative liabilities | 1,140 | 3,624
Designated as Hedging Instrument | Other liabilities | Interest rate swaps |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Fair value, derivative liabilities | 1,140 | 3,624
Not Designated as Hedging Instrument | Other assets |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Fair value, derivative assets | 8,936 | 10,864
Not Designated as Hedging Instrument | Other assets | Interest rate swaps |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Fair value, derivative assets | 8,776 | 10,683
Not Designated as Hedging Instrument | Other assets | Credit contracts |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Fair value, derivative assets | 100 | 136
Not Designated as Hedging Instrument | Other assets | Residential mortgage loan commitments |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Fair value, derivative assets | 60 | 45
Not Designated as Hedging Instrument | Other liabilities |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Fair value, derivative liabilities | 8,934 | 10,548
Not Designated as Hedging Instrument | Other liabilities | Interest rate swaps |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Fair value, derivative liabilities | 8,897 | 10,537
Not Designated as Hedging Instrument | Other liabilities | Credit contracts |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Fair value, derivative liabilities | 37 | 11
Not Designated as Hedging Instrument | Other liabilities | Residential mortgage loan commitments |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Fair value, derivative liabilities | $ 0 | $ 0

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- Definition Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226000-175313 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=82924980&loc=SL51823488-111719 + Details
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