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Borrowed Funds (Summary of Short Term Borrowings) (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Overnight borrowings, interest rate | 2.42% |
Outstanding at end of period | $ 86,805 | $ 48,845
Short-term FHLB Advance [Member] |  |
Overnight borrowings | 39,000 | 0
Securities Sold under Agreements to Repurchase [Member] |  |
Outstanding at end of period | $ 47,805 | $ 48,845
Weighted average interest rate | 0.17% | 0.15%
Maximum amount outstanding as of any month end | $ 54,595 | $ 58,438
Average amount outstanding | $ 42,584 | $ 37,326
Approximate weighted average rate during the period | 0.19% | 0.19%

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- Definition Amount of advances from the Federal Home Loan Bank (FHLB). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + Details
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- Definition Discloses the single interest rate [if] applicable to the advances from the Federal Home Loan Bank, by branch, as of the Balance Sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + Details
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