Regulatory Matters (Summary Of Actual Capital Amounts And Ratios) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Summit [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
CET1 (to risk weighted assets), Actual Amount	$ 176,666	$ 146,494
CET1 (to risk weighted assets), Actual Ratio	10.80%	10.50%
CET1 (to risk weighted assets), Minimum Required Capital, Amount	$ 114,506	$ 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	$ 106,327	$ 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	$ 195,666	$ 164,357
Tier I Capital (to risk weighted assets), Actual Ratio	11.90%	11.80%
Tier I Capital (to risk weighted assets), Minimum Required Capital, Amount	$ 139,761	$ 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	$ 131,540	$ 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	$ 208,130	$ 176,031
Total Capital (to risk weighted assets), Actual Ratio	12.70%	12.60%
Total Capital (to risk weighted assets), Minimum Required Capital, Amount	$ 172,076	$ 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	$ 163,882	$ 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	$ 195,666	$ 164,357
Tier I Capital (to average assets), Actual Ratio	9.50%	9.40%
Tier I Capital (to average assets), Minimum Required Capital, Amount	$ 82,386	$ 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	$ 102,982	$ 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	$ 194,410	$ 165,747
CET1 (to risk weighted assets), Actual Ratio	11.80%	11.90%
CET1 (to risk weighted assets), Minimum Required Capital, Amount	$ 115,328	$ 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	$ 107,090	$ 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	$ 194,410	$ 165,747
Tier I Capital (to risk weighted assets), Actual Ratio	11.80%	11.90%
Tier I Capital (to risk weighted assets), Minimum Required Capital, Amount	$ 140,041	$ 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	$ 131,803	$ 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	$ 206,874	$ 177,421
Total Capital (to risk weighted assets), Actual Ratio	12.60%	12.70%
Total Capital (to risk weighted assets), Minimum Required Capital, Amount	$ 172,395	$ 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	$ 164,186	$ 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	$ 194,410	$ 165,747
Tier I Capital (to average assets), Actual Ratio	9.40%	9.50%
Tier I Capital (to average assets), Minimum Required Capital, Amount	$ 82,728	$ 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	$ 103,410	$ 87,235
Tier I Capital (to average assets), Minimum Required To Be Well Capitalized, Ratio	5.00%	5.00%