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Derivative Financial Instruments - Notional Amounts and Fair Values (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Derivatives designated as hedging instruments | Interest rate swaps |  |
Notional amounts and fair values of derivatives |  |
Notional Amount | $ 193,022 | $ 194,687
Derivatives designated as hedging instruments | Interest rate swaps | Included in other assets |  |
Notional amounts and fair values of derivatives |  |
Asset Derivatives | 266 |
Derivatives designated as hedging instruments | Interest rate swaps | Included in other liabilities |  |
Notional amounts and fair values of derivatives |  |
Liability Derivatives | (312) | (2,032)
Derivatives Not Designated as Hedging Instruments | Interest rate swaps |  |
Notional amounts and fair values of derivatives |  |
Notional Amount | 2,156,450 | 1,820,442
Derivatives Not Designated as Hedging Instruments | Interest rate swaps | Included in other assets |  |
Notional amounts and fair values of derivatives |  |
Asset Derivatives | 5,117 | 14,658
Derivatives Not Designated as Hedging Instruments | Interest rate swaps | Included in other liabilities |  |
Notional amounts and fair values of derivatives |  |
Liability Derivatives | (22,932) | (13,017)
Derivatives Not Designated as Hedging Instruments | Funding Swap (Visa Derivative) |  |
Notional amounts and fair values of derivatives |  |
Notional Amount | 58,237 | 43,113
Derivatives Not Designated as Hedging Instruments | Funding Swap (Visa Derivative) | Included in other liabilities |  |
Notional amounts and fair values of derivatives |  |
Liability Derivatives | (4,114) | (5,439)
Derivatives Not Designated as Hedging Instruments | Foreign exchange contracts |  |
Notional amounts and fair values of derivatives |  |
Notional Amount | 4,801 | 3,658
Derivatives Not Designated as Hedging Instruments | Foreign exchange contracts | Included in other assets |  |
Notional amounts and fair values of derivatives |  |
Asset Derivatives | 1 | $ 24
Derivatives Not Designated as Hedging Instruments | Foreign exchange contracts | Included in other liabilities |  |
Notional amounts and fair values of derivatives |  |
Liability Derivatives | $ (69) |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Fair value, after the 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 not subject to a master netting arrangement and not elected to be offset. + 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 (c) -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 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13495-108611 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226008-175313 + Details
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