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Derivative Instruments and Hedging Activities - Fair Value of Derivative Financial Instruments (Detail) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Interest Rate Swaps |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Derivative Assets, Fair Value | $ 11,716 | $ 5,930
Derivative Liabilities, Fair Value | 2,405 | 5,058
Other Assets | Derivative Designated as Cash Flow Hedges | Interest Rate Swaps |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Derivative Assets, Fair Value | 1,224 | 816
Other Assets | Not Designated as Hedging Instrument |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Derivative Assets, Fair Value | 12,382 | 8,936
Other Assets | Not Designated as Hedging Instrument | Residential Mortgage Loan Commitments |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Derivative Assets, Fair Value | 83 | 60
Other Assets | Not Designated as Hedging Instrument | Interest Rate Swaps |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Derivative Assets, Fair Value | 12,235 | 8,776
Other Assets | Not Designated as Hedging Instrument | Credit Contract |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Derivative Assets, Fair Value | 64 | 100
Other Liabilities | Derivative Designated as Cash Flow Hedges | Interest Rate Swaps |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Derivative Liabilities, Fair Value | 545 | 1,140
Other Liabilities | Not Designated as Hedging Instrument |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Derivative Liabilities, Fair Value | 12,128 | 8,934
Other Liabilities | Not Designated as Hedging Instrument | Residential Mortgage Loan Commitments |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Derivative Liabilities, Fair Value | 0 | 0
Other Liabilities | Not Designated as Hedging Instrument | Interest Rate Swaps |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Derivative Liabilities, Fair Value | 12,104 | 8,897
Other Liabilities | Not Designated as Hedging Instrument | Credit Contract |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Derivative Liabilities, Fair Value | $ 24 | $ 37

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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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