Borrowed Funds (Summary of Short-term Borrowings) (Details) - Securities Sold under Agreements to Repurchase [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Short-term Debt [Line Items]
Outstanding at end of year	$ 49,160	$ 48,728
Weighted average interest rate at end of period	0.19%	0.23%
Maximum amount outstanding as of any month end	$ 55,290	$ 50,345
Average amount outstanding	$ 46,519	$ 39,778
Approximate weighted average rate during the year	0.20%	0.28%