Borrowed Funds (Summary of Short Term Borrowings) (Details) - Securities Sold under Agreements to Repurchase [Member] - USD ($) $ in Thousands |
9 Months Ended | 12 Months Ended |
|---|---|---|
Sep. 30, 2020 |
Dec. 31, 2019 |
|
| Short-term Debt [Line Items] | ||
| Outstanding at end of period | $ 52,589 | $ 48,728 |
| Weighted average interest rate at end of period | 0.18% | 0.23% |
| Maximum amount outstanding as of any month end | $ 52,589 | $ 50,345 |
| Average amount outstanding | $ 43,895 | $ 39,778 |
| Approximate weighted average rate during the period | 0.21% | 0.28% |