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Borrowed Funds (Summary of Short Term Borrowings) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
Overnight borrowings, interest rate |  | 2.70%
Outstanding at end of period | $ 39,695 | $ 77,707
Short-term FHLB Advance [Member] |  |
Overnight borrowings | 0 | 40,000
Securities Sold under Agreements to Repurchase [Member] |  |
Outstanding at end of period | $ 39,695 | $ 37,707
Weighted average interest rate | 0.66% | 0.24%
Maximum amount outstanding as of any month end | $ 40,579 | $ 55,648
Average amount outstanding | $ 37,624 | $ 44,045
Approximate weighted average rate during the period | 0.69% | 0.20%

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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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