Regulatory Matters (Summary Of Actual Capital Amounts And Ratios) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Summit [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
CET1 (to risk weighted assets), Actual Amount	$ 206,142	$ 197,551
CET1 (to risk weighted assets), Actual Ratio	11.40%	11.10%
Tier I Capital (to risk weighted assets), Actual Amount	$ 225,142	$ 216,551
Tier I Capital (to risk weighted assets), Actual Ratio	12.50%	12.20%
Total Capital (to risk weighted assets), Actual Amount	$ 238,274	$ 229,598
Total Capital (to risk weighted assets), Actual Ratio	13.20%	12.90%
Tier I Capital (to average assets), Actual Amount	$ 225,142	$ 216,551
Tier I Capital (to average assets), Actual Ratio	10.20%	10.10%
Summit Community [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
CET1 (to risk weighted assets), Actual Amount	$ 222,400	$ 213,930
CET1 (to risk weighted assets), Actual Ratio	12.30%	12.00%
CET1 (to risk weighted assets), Minimum Required Capital, Amount	$ 126,569	$ 124,793
CET1 (to risk weighted assets), Minimum Required Capital, Ratio	7.00%	7.00%
CET1 (to risk weighted assets), Minimum Required To Be Well Capitalized, Amount	$ 117,528	$ 115,879
CET1 (to risk weighted assets), Minimum Required To Be Well Capitalized, Ratio	6.50%	6.50%
Tier I Capital (to risk weighted assets), Actual Amount	$ 222,400	$ 213,930
Tier I Capital (to risk weighted assets), Actual Ratio	12.30%	12.00%
Tier I Capital (to risk weighted assets), Minimum Required Capital, Amount	$ 153,691	$ 151,534
Tier I Capital (to risk weighted assets), Minimum Required Capital, Ratio	8.50%	8.50%
Tier I Capital (to risk weighted assets), Minimum Required To Be Well Capitalized, Amount	$ 144,650	$ 142,620
Tier I Capital (to risk weighted assets), Minimum Required To Be Well Capitalized, Ratio	8.00%	8.00%
Total Capital (to risk weighted assets), Actual Amount	$ 235,532	$ 226,977
Total Capital (to risk weighted assets), Actual Ratio	13.00%	12.80%
Total Capital (to risk weighted assets), Minimum Required Capital, Amount	$ 190,237	$ 186,192
Total Capital (to risk weighted assets), Minimum Required Capital, Ratio	10.50%	10.50%
Total Capital (to risk weighted assets), Minimum Required To Be Well Capitalized, Amount	$ 181,178	$ 177,326
Total Capital (to risk weighted assets), Minimum Required To Be Well Capitalized, Ratio	10.00%	10.00%
Tier I Capital (to average assets), Actual Amount	$ 222,400	$ 213,930
Tier I Capital (to average assets), Actual Ratio	10.00%	10.00%
Tier I Capital (to average assets), Minimum Required Capital, Amount	$ 88,960	$ 85,572
Tier I Capital (to average assets), Minimum Required Capital, Ratio	4.00%	4.00%
Tier I Capital (to average assets), Minimum Required To Be Well Capitalized, Amount	$ 111,200	$ 106,965
Tier I Capital (to average assets), Minimum Required To Be Well Capitalized, Ratio	5.00%	5.00%