Regulatory Matters (Summary Of Actual Capital Amounts And Ratios) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Summit [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common Equity Tier One Capital	$ 224,679	$ 197,551
Common Equity Tier One Capital Ratio	11.10%	11.10%
Tier I Capital (to risk weighted assets ), Actual Amount	$ 243,679	$ 216,551
Tier I Capital (to risk weighted assets), Actual Ratio	12.10%	12.20%
Total Capital (to risk weighted assets), Actual Amount	$ 256,753	$ 229,598
Total Capital (to risk weighted assets), Actual Ratio	12.70%	12.90%
Tier I Capital (to average assets), Actual Amount	$ 243,679	$ 216,551
Tier I Capital (to average assets), Actual Ratio	10.50%	10.10%
Summit Community [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common Equity Tier One Capital	$ 244,045	$ 213,930
Common Equity Tier One Capital Ratio	12.10%	12.00%
Common Equity Tier One Capital Required for Capital Adequacy	$ 141,183	$ 124,793
Tier One Common Equity Required for Capital Adequacy to Risk Weighted Assets	7.00%	7.00%
Common Equity Tier One Capital Required to be Well-Capitalized	$ 131,099	$ 115,879
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	$ 244,045	$ 213,930
Tier I Capital (to risk weighted assets), Actual Ratio	12.10%	12.00%
Tier I Capital (to risk weighted assets), Minimum Required Regulatory Capital, Amount	$ 171,437	$ 151,534
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	$ 161,352	$ 142,620
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	$ 257,119	$ 226,977
Total Capital (to risk weighted assets), Actual Ratio	12.70%	12.80%
Total Capital (to risk weighted assets), Minimum Required Regulatory Capital, Amount	$ 212,579	$ 186,192
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	$ 202,456	$ 177,326
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	$ 244,045	$ 213,930
Tier I Capital (to average assets), Actual Ratio	10.60%	10.00%
Tier I Capital (to average assets), Minimum Required Regulatory Capital, Amount	$ 92,092	$ 85,572
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	$ 115,116	$ 106,965
Tier I Capital (to average assets), To be Well Capitalized under Prompt Corrective Action Provisions, Ratio	5.00%	5.00%