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Short-Term Borrowings (Details 1) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Average balances and cost of funds of short-term borrowings |  |  |
Average Balances | $ 217,547 | $ 356,929 | $ 223,090
Cost of Funds | 1.22% | 0.45% | 0.18%
Federal Home Loan Bank short-term advances |  |  |
Average balances and cost of funds of short-term borrowings |  |  |
Average Balances | $ 208,332 | $ 344,724 | $ 207,575
Cost of Funds | 1.27% | 0.46% | 0.18%
Securities sold under agreements to repurchase |  |  |
Average balances and cost of funds of short-term borrowings |  |  |
Average Balances | $ 9,215 | $ 12,205 | $ 15,515
Cost of Funds | 0.17% | 0.20% | 0.21%

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- Definition Weighted average interest rate of short-term debt outstanding calculated at point in time. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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