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Short-Term Borrowings and Long-Term Debt Repurchase Agreements (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Short-term Debt [Line Items] |  |  |
Amount outstanding as of December 31 | $ 617,524 | $ 541,317 | $ 497,663
Customer repurchase agreements |  |  |
Short-term Debt [Line Items] |  |  |
Amount outstanding as of December 31 | $ 172,017 | $ 195,734 | $ 111,496
Weighted average interest rate as of December 31 | 0.13% | 0.10% | 0.15%
Average amount outstanding during the year | $ 188,974 | $ 184,978 | $ 161,093
Weighted average interest rate during the year | 0.12% | 0.11% | 0.10%

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