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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%