Regulatory Matters (Summary Of Actual Capital Amounts And Ratios) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Summit [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier One Common Equity	$ 146,494	$ 137,849
Tier One Common Equity to Risk Weighted Assets	10.50%	11.80%
Tier One Common Equity Required for Capital Adequacy	$ 97,663	$ 81,775
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	$ 90,687	$ 75,934
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	$ 164,357	$ 156,849
Tier I Capital (to risk weighted assets), Actual Ratio	11.80%	13.40%
Tier I Capital (to risk weighted assets), Minimum Required Regulatory Capital, Amount	$ 118,393	$ 99,494
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	$ 111,428	$ 93,641
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	$ 176,031	$ 168,321
Total Capital (to risk weighted assets), Actual Ratio	12.60%	14.40%
Total Capital (to risk weighted assets), Minimum Required Regulatory Capital, Amount	$ 146,693	$ 122,734
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	$ 139,707	$ 116,890
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	$ 164,357	$ 156,849
Tier I Capital (to average assets), Actual Ratio	9.40%	10.70%
Tier I Capital (to average assets), Minimum Required Regulatory Capital, Amount	$ 69,939	$ 58,635
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	$ 87,424	$ 73,294
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	$ 165,747	$ 158,081
Tier One Common Equity to Risk Weighted Assets	11.90%	13.60%
Tier One Common Equity Required for Capital Adequacy	$ 97,498	$ 81,365
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	$ 90,534	$ 75,553
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	$ 165,747	$ 158,081
Tier I Capital (to risk weighted assets), Actual Ratio	11.90%	13.60%
Tier I Capital (to risk weighted assets), Minimum Required Regulatory Capital, Amount	$ 118,391	$ 98,801
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	$ 111,427	$ 92,989
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	$ 177,421	$ 169,553
Total Capital (to risk weighted assets), Actual Ratio	12.70%	14.50%
Total Capital (to risk weighted assets), Minimum Required Regulatory Capital, Amount	$ 146,687	$ 122,780
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	$ 139,702	$ 116,933
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	$ 165,747	$ 158,081
Tier I Capital (to average assets), Actual Ratio	9.50%	10.80%
Tier I Capital (to average assets), Minimum Required Regulatory Capital, Amount	$ 69,788	$ 58,549
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	$ 87,235	$ 73,186
Tier I Capital (to average assets), To be Well Capitalized under Prompt Corrective Action Provisions, Ratio	5.00%	5.00%