Regulatory Matters (Summary Of Actual Capital Amounts And Ratios) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Summit [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
CET1 (to risk weighted assets), Actual Amount	$ 171,400	$ 146,494
CET1 (to risk weighted assets), Actual Ratio	10.50%	10.50%
CET1 (to risk weighted assets), Minimum Required Capital, Amount	$ 114,267	$ 97,663
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	$ 106,105	$ 90,687
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	$ 190,400	$ 164,357
Tier I Capital (to risk weighted assets), Actual Ratio	11.70%	11.80%
Tier I Capital (to risk weighted assets), Minimum Required Capital, Amount	$ 138,325	$ 118,393
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	$ 130,188	$ 111,428
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	$ 202,732	$ 176,031
Total Capital (to risk weighted assets), Actual Ratio	12.40%	12.60%
Total Capital (to risk weighted assets), Minimum Required Capital, Amount	$ 171,668	$ 146,693
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	$ 163,494	$ 139,707
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	$ 190,400	$ 164,357
Tier I Capital (to average assets), Actual Ratio	9.20%	9.40%
Tier I Capital (to average assets), Minimum Required Capital, Amount	$ 82,783	$ 69,939
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	$ 103,478	$ 87,424
Tier I Capital (to average assets), Minimum Required To Be Well Capitalized, Ratio	5.00%	5.00%
Summit Community [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
CET1 (to risk weighted assets), Actual Amount	$ 189,431	$ 165,747
CET1 (to risk weighted assets), Actual Ratio	11.60%	11.90%
CET1 (to risk weighted assets), Minimum Required Capital, Amount	$ 114,312	$ 97,498
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	$ 106,147	$ 90,534
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	$ 189,431	$ 165,747
Tier I Capital (to risk weighted assets), Actual Ratio	11.60%	11.90%
Tier I Capital (to risk weighted assets), Minimum Required Capital, Amount	$ 138,807	$ 118,391
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	$ 130,642	$ 111,427
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	$ 201,763	$ 177,421
Total Capital (to risk weighted assets), Actual Ratio	12.40%	12.70%
Total Capital (to risk weighted assets), Minimum Required Capital, Amount	$ 170,848	$ 146,687
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	$ 162,712	$ 139,702
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	$ 189,431	$ 165,747
Tier I Capital (to average assets), Actual Ratio	9.20%	9.50%
Tier I Capital (to average assets), Minimum Required Capital, Amount	$ 82,361	$ 69,788
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	$ 102,952	$ 87,235
Tier I Capital (to average assets), Minimum Required To Be Well Capitalized, Ratio	5.00%	5.00%