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Derivative Instruments and Hedging Activities (Tables) | 9 Months Ended
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Sep. 30, 2018
Derivative Instruments And Hedging Activities Disclosure [Abstract] |
Fair Values of Derivative Instruments on the Balance Sheet |
|  |  |  |  |  |  |  |  |  | Asset derivatives |  |  | Liability derivatives |
|  | Gross notional amount |  |  | Balance |  | Fair value |  |  | Balance |  | Fair value |
|  | Sept. 30, 2018 |  |  | Dec. 31, 2017 |  |  | sheet line item |  | Sept. 30, 2018 |  |  | Dec. 31, 2017 |  |  | sheet line item |  | Sept. 30, 2018 |  |  | Dec. 31, 2017 |
Derivatives designated as hedging instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash flow hedges |  | $ | 100,000 |  |  | $ | — |  |  | Other assets |  | $ | 1,305 |  |  | $ | — |  |  | Other liabilities |  | $ | — |  |  | $ | — |
Total derivatives |  | $ | 100,000 |  |  | $ | — |  |  |  |  | $ | 1,305 |  |  | $ | — |  |  |  |  | $ | — |  |  | $ | — |
Derivatives not designated as hedging instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swaps |  | $ | 35,915 |  |  | $ | — |  |  | Other assets |  | $ | 298 |  |  | $ | — |  |  | Other liabilities |  | $ | 348 |  |  | $ | — |
Credit contracts |  |  | 34,741 |  |  |  | 12,282 |  |  | Other assets |  |  | — |  |  |  | — |  |  | Other liabilities |  |  | 8 |  |  |  | 4 |
Total derivatives |  | $ | 70,656 |  |  | $ | 12,282 |  |  |  |  | $ | 298 |  |  | $ | — |  |  |  |  | $ | 356 |  |  | $ | 4 |
Effect of Derivative Instruments on the Income Statement |
|  |  |  | Gain (loss) recognized in income |  |  | Gain (loss) recognized in income |
|  | Line item of gain (loss) |  | Three months ended September 30, |  |  | Nine months ended September 30, |
Undesignated derivatives |  | recognized in income |  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Interest rate swaps |  | Net gain on derivative instruments |  | $ | 349 |  |  | $ | — |  |  | $ | 419 |  |  | $ | — |
Credit contracts |  | Net gain on derivative instruments |  |  | 5 |  |  |  | 127 |  |  |  | 187 |  |  |  | 127 |
Total undesignated |  |  |  | $ | 354 |  |  | $ | 127 |  |  | $ | 606 |  |  | $ | 127 |

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- Definition Tabular disclosure of the location and amount of derivative instruments and nonderivative instruments designated as hedging instruments reported before netting adjustments, and the amount of gain (loss) on derivative instruments and nonderivative instruments designated and qualified as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4E -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624181-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 + Details
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- Definition Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959 + Details
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