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Borrowings - Short Term Borrowings (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 USD ($)
Short-term borrowings: |
Short-Term | $ 500,175
Maximum outstanding at any month end | 710,005
ABCP borrowings |
Short-term borrowings: |
Short-Term | $ 500,175
Weighted Average Interest Rate | 0.84%
Average Balance | $ 135,064
Weighted Average Interest Rate | 3.10%

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