Regulatory Matters (Summary Of Actual Capital Amounts And Ratios) (Details) $ in Thousands	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Summit [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common Equity Tier One Capital	$ 233,768	$ 224,679
Common Equity Tier One Capital Ratio	0.093	0.111
Tier I Capital (to risk weighted assets ), Actual Amount	$ 252,768	$ 243,679
Tier I Capital (to risk weighted assets), Actual Ratio	0.100	0.121
Total Capital (to risk weighted assets), Actual Amount	$ 305,309	$ 256,753
Total Capital (to risk weighted assets), Actual Ratio	0.121	0.127
Tier I Capital (to average assets), Actual Amount	$ 252,768	$ 243,679
Tier I Capital (to average assets), Actual Ratio	0.086	0.105
Summit Community [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common Equity Tier One Capital	$ 279,540	$ 244,045
Common Equity Tier One Capital Ratio	0.111	0.121
Common Equity Tier One Capital Required for Capital Adequacy	$ 176,286	$ 141,183
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	$ 163,695	$ 131,099
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	$ 279,540	$ 244,045
Tier I Capital (to risk weighted assets), Actual Ratio	0.111	0.121
Tier I Capital (to risk weighted assets), Minimum Required Regulatory Capital, Amount	$ 214,062	$ 171,437
Tier I Capital (to risk weighted assets), Minimum Required Regulatory Capital, Ratio	0.085	0.085
Tier I Capital (to risk weighted assets), To be Well Capitalized under Prompt Corrective Action Provisions, Amount	$ 201,470	$ 161,352
Tier I Capital (to risk weighted assets), To be Well Capitalized under Prompt Corrective Action Provisions, Ratio	0.080	0.080
Total Capital (to risk weighted assets), Actual Amount	$ 302,716	$ 257,119
Total Capital (to risk weighted assets), Actual Ratio	0.120	0.127
Total Capital (to risk weighted assets), Minimum Required Regulatory Capital, Amount	$ 264,877	$ 212,579
Total Capital (to risk weighted assets), Minimum Required Regulatory Capital, Ratio	0.105	0.105
Total Capital (to risk weighted assets), To be Well Capitalized under Prompt Corrective Action Provisions, Amount	$ 252,263	$ 202,456
Total Capital (to risk weighted assets), To be Well Capitalized under Prompt Corrective Action Provisions, Ratio	0.100	0.100
Tier I Capital (to average assets), Actual Amount	$ 279,540	$ 244,045
Tier I Capital (to average assets), Actual Ratio	0.095	0.106
Tier I Capital (to average assets), Minimum Required Regulatory Capital, Amount	$ 117,701	$ 92,092
Tier I Capital (to average assets), Minimum Required Regulatory Capital, Ratio	0.040	0.040
Tier I Capital (to average assets), To be Well Capitalized under Prompt Corrective Action Provisions, Amount	$ 147,126	$ 115,116
Tier I Capital (to average assets), To be Well Capitalized under Prompt Corrective Action Provisions, Ratio	0.050	0.050