Regulatory Matters (Summary Of Actual Capital Amounts And Ratios) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Summit [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier One Common Equity	$ 177,010	$ 146,494
Tier One Common Equity to Risk Weighted Assets	10.60%	10.50%
Tier One Common Equity Required for Capital Adequacy	$ 116,893	$ 97,663
Tier One Common Equity Required for Capital Adequacy to Risk Weighted Assets	7.00%	7.00%
Tier One Common Equity Required to be Well Capitalized	$ 108,544	$ 90,687
Tier One Common Equity Required to be Well Capitalized to Risk Weighted Assets	6.50%	6.50%
Tier I Capital (to risk weighted assets ), Actual Amount	$ 196,010	$ 164,357
Tier I Capital (to risk weighted assets), Actual Ratio	11.80%	11.80%
Tier I Capital (to risk weighted assets), Minimum Required Regulatory Capital, Amount	$ 141,194	$ 118,393
Tier I Capital (to risk weighted assets), Minimum Required Regulatory Capital, Ratio	8.50%	8.50%
Tier I Capital (to risk weighted assets), To be Well Capitalized under Prompt Corrective Action Provisions, Amount	$ 132,888	$ 111,428
Tier I Capital (to risk weighted assets), To be Well Capitalized under Prompt Corrective Action Provisions, Ratio	8.00%	8.00%
Total Capital (to risk weighted assets), Actual Amount	$ 208,575	$ 176,031
Total Capital (to risk weighted assets), Actual Ratio	12.50%	12.60%
Total Capital (to risk weighted assets), Minimum Required Regulatory Capital, Amount	$ 175,203	$ 146,693
Total Capital (to risk weighted assets), Minimum Required Regulatory Capital, Ratio	10.50%	10.50%
Total Capital (to risk weighted assets), To be Well Capitalized under Prompt Corrective Action Provisions, Amount	$ 166,860	$ 139,707
Total Capital (to risk weighted assets), To be Well Capitalized under Prompt Corrective Action Provisions, Ratio	10.00%	10.00%
Tier I Capital (to average assets), Actual Amount	$ 196,010	$ 164,357
Tier I Capital (to average assets), Actual Ratio	9.40%	9.40%
Tier I Capital (to average assets), Minimum Required Regulatory Capital, Amount	$ 83,409	$ 69,939
Tier I Capital (to average assets), Minimum Required Regulatory Capital, Ratio	4.00%	4.00%
Tier I Capital (to average assets), To be Well Capitalized under Prompt Corrective Action Provisions, Amount	$ 104,261	$ 87,424
Tier I Capital (to average assets), To be Well Capitalized under Prompt Corrective Action Provisions, Ratio	5.00%	5.00%
Summit Community [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier One Common Equity	$ 195,008	$ 165,747
Tier One Common Equity to Risk Weighted Assets	11.70%	11.90%
Tier One Common Equity Required for Capital Adequacy	$ 116,671	$ 97,498
Tier One Common Equity Required for Capital Adequacy to Risk Weighted Assets	7.00%	7.00%
Tier One Common Equity Required to be Well Capitalized	$ 108,338	$ 90,534
Tier One Common Equity Required to be Well Capitalized to Risk Weighted Assets	6.50%	6.50%
Tier I Capital (to risk weighted assets ), Actual Amount	$ 195,008	$ 165,747
Tier I Capital (to risk weighted assets), Actual Ratio	11.70%	11.90%
Tier I Capital (to risk weighted assets), Minimum Required Regulatory Capital, Amount	$ 141,672	$ 118,391
Tier I Capital (to risk weighted assets), Minimum Required Regulatory Capital, Ratio	8.50%	8.50%
Tier I Capital (to risk weighted assets), To be Well Capitalized under Prompt Corrective Action Provisions, Amount	$ 133,339	$ 111,427
Tier I Capital (to risk weighted assets), To be Well Capitalized under Prompt Corrective Action Provisions, Ratio	8.00%	8.00%
Total Capital (to risk weighted assets), Actual Amount	$ 207,573	$ 177,421
Total Capital (to risk weighted assets), Actual Ratio	12.50%	12.70%
Total Capital (to risk weighted assets), Minimum Required Regulatory Capital, Amount	$ 174,361	$ 146,687
Total Capital (to risk weighted assets), Minimum Required Regulatory Capital, Ratio	10.50%	10.50%
Total Capital (to risk weighted assets), To be Well Capitalized under Prompt Corrective Action Provisions, Amount	$ 166,058	$ 139,702
Total Capital (to risk weighted assets), To be Well Capitalized under Prompt Corrective Action Provisions, Ratio	10.00%	10.00%
Tier I Capital (to average assets), Actual Amount	$ 195,008	$ 165,747
Tier I Capital (to average assets), Actual Ratio	9.40%	9.50%
Tier I Capital (to average assets), Minimum Required Regulatory Capital, Amount	$ 82,982	$ 69,788
Tier I Capital (to average assets), Minimum Required Regulatory Capital, Ratio	4.00%	4.00%
Tier I Capital (to average assets), To be Well Capitalized under Prompt Corrective Action Provisions, Amount	$ 103,728	$ 87,235
Tier I Capital (to average assets), To be Well Capitalized under Prompt Corrective Action Provisions, Ratio	5.00%	5.00%