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Short-term Borrowings (Tables) | 12 Months Ended
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Dec. 31, 2017
Summary of Long-term Advances from the Federal Home Loan Bank | At year end, long-term advances from the FHLB were as follows:
|  | 2017 |  |  | 2016 |
|  |  |  |  |  | Weighted |  |  |  |  |  |  | Weighted |
|  |  |  |  |  | Average |  |  |  |  |  |  | Average |
|  | Amount |  |  | Rate |  |  | Amount |  |  | Rate |
Fixed-rate constant payment advance, at rates from 1.20% to 1.70% at December 31, 2017 and 2016 |  | $ | 4,785 |  |  |  | 1.70 | % |  | $ | 7,876 |  |  |  | 1.57 | %
Convertible and putable fixed-rate advance with a rate of 4.45% at December 31, 2016 |  |  | 0 |  |  |  | 0.00 | % |  |  | 5,000 |  |  |  | 4.45 | %
Total advances |  | $ | 4,785 |  |  |  | 1.70 | % |  | $ | 12,876 |  |  |  | 2.69 | %
Summary of Securities Sold under Agreements to Repurchase | The securities are held in segregated safekeeping accounts at the Federal Reserve Bank, Trust and the FHLB. Information concerning securities sold under agreements to repurchase is summarized as follows
|  | 2017 |  |  | 2016 |  |  | 2015 |
Average balance during the year |  | $ | 82,627 |  |  | $ | 84,368 |  |  | $ | 71,779 |
Average interest rate during the year |  |  | 0.13 | % |  |  | 0.07 | % |  |  | 0.07 | %
Maximum month-end balance during the year |  | $ | 94,208 |  |  | $ | 98,687 |  |  | $ | 89,574 |
Weighted average year-end interest rate |  |  | 0.14 | % |  |  | 0.08 | % |  |  | 0.06 | %
Balance at year-end |  | $ | 74,215 |  |  | $ | 78,110 |  |  | $ | 75,482 |
Schedule Disaggregation of the Obligation by the Class of Collateral Pledged for Short-Term Financing Obtained Through the Sales of Repurchase Agreements | The following table provides a disaggregation of the obligation by class of collateral pledged for short-term financing obtained through the sales of repurchase agreements:
|  | 2017 |  |  | 2016 |
Overnight and continuous repurchase agreements |  |  |  |  |  |  |  |
U.S. Treasury and U.S. government sponsored entities |  | $ | 4,811 |  |  | $ | 6,555 |
State and political subdivisions |  |  | 20,696 |  |  |  | 12,304 |
Mortgage-backed securities - residential |  |  | 43,936 |  |  |  | 52,628 |
Collateralized mortgage obligations |  |  | 4,772 |  |  |  | 6,623 |
Total borrowings |  | $ | 74,215 |  |  | $ | 78,110 |
Pledged |
Summary of Long-term Advances from the Federal Home Loan Bank | FHLB advances are secured by pledgings described in the following Long-Term Borrowings footnote. Balances at year end were as follows:
|  | 2017 |  |  | 2016 |
|  |  |  |  |  | Weighted |  |  |  |  |  |  | Weighted |
|  |  |  |  |  | Average |  |  |  |  |  |  | Average |
|  | Amount |  |  | Rate |  |  | Amount |  |  | Rate |
Repurchase advance with a rate of .59% to 1.48% at December 31, 2017 and 2016 |  | $ | 125,000 |  |  |  | 1.47 | % |  | $ | 100,000 |  |  |  | 0.63 | %
Fixed rate advances with a rate of 1.43% to 1.49% at December 31, 2017 |  |  | 90,000 |  |  |  | 1.45 | % |  |  | 0 |  |  |  | 0.00 | %
Cash management advance with rates from 0% to .59% at December 31, 2017 and 2016 |  |  | 0 |  |  |  | 0.00 | % |  |  | 20,000 |  |  |  | 0.59 | %
Total advances |  | $ | 215,000 |  |  |  | 1.46 | % |  | $ | 120,000 |  |  |  | 0.63 | %

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- Definition Summary of securities sold under agreements to repurchase. + References No definition available. + Details
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- Definition Tabular disclosure of advances made and reported by Federal Home Loan Bank (FHLBank). + References No definition available. + Details
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- Definition The entire disclosure for repurchase agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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