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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, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Short-term Debt [Line Items] |  |  |
Amount outstanding as of December 31 | $ 497,663 | $ 329,719 | $ 1,258,629
Customer repurchase agreements |  |  |
Short-term Debt [Line Items] |  |  |
Amount outstanding as of December 31 | $ 111,496 | $ 158,394 | $ 175,621
Weighted average interest rate as of December 31 | 0.15% | 0.13% | 0.12%
Average amount outstanding during the year | $ 161,093 | $ 197,432 | $ 186,851
Weighted average interest rate during the year | 0.10% | 0.10% | 0.11%

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