Short-Term Borrowings and Long-Term Debt (Schedule of Debt) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Long-term debt
Long-term debt outstanding at end of period	$ 12,231	$ 27,302
Weighted average rate on outstanding long-term debt	0.82%	0.61%
Maximum outstanding long-term debt of any month end	$ 27,296	$ 67,359
Average outstanding long-term debt	$ 23,072	$ 53,615
Approximate average rate paid on long-term debt	0.95%	2.56%
Short-term borrowings
Short-term borrowings outstanding at end of period	$ 0	$ 0
Weighted average rate on short-term borrowings	0.00%	0.00%
Maximum outstanding short-term borrowings at any month end	$ 0	$ 27,000
Average outstanding short-term borrowings	$ 0	$ 8,156
Approximate average rate paid on short-term borrowings	0.00%	1.36%
PPPLF advances
PPPLF advances outstanding at end of period	$ 0	$ 0
Weighted average rate on PPPLF advances	0.00%	0.00%
Maximum outstanding PPPLF advances at any month end	$ 0	$ 127,674
Average outstanding PPPLF advances	$ 0	$ 60,360
Approximate average rate paid on PPPLF advances	0.00%	0.35%