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Derivatives (Details) - Interest Rate Swap - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
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Fair Value Hedging |  |
Summarized details of swaps outstanding and the related hedged items |  |
Aggregate notional amount | $ 725,000,000 |
Derivative, fair value | 10,000,000 | $ 7,000,000
Cash Flow Hedging |  |
Summarized details of swaps outstanding and the related hedged items |  |
Aggregate notional amount | $ 15,492,000 |

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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 Summary of derivative instruments and hedged items. + References No definition available. + Details
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- Definition Fair value of the assets less the liabilities of a derivative or group of derivatives. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611 + Details
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