Borrowed Funds (Summary of Short Term Borrowings) (Details) - Securities Sold under Agreements to Repurchase [Member] - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Short-term Debt [Line Items]
Outstanding at end of period	$ 39,418	$ 48,728
Weighted average interest rate at end of period	0.28%	0.23%
Maximum amount outstanding as of any month end	$ 45,604	$ 50,345
Average amount outstanding	$ 45,275	$ 39,778
Approximate weighted average rate during the period	0.25%	0.28%