Regulatory Matters (Summary Of Actual Capital Amounts And Ratios) (Details) $ in Thousands	Sep. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)
Summit [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
CET1 (to risk weighted assets), Actual Amount	$ 231,568	$ 224,679
CET1 (to risk weighted assets), Actual Ratio	0.099	0.111
Tier I Capital (to risk weighted assets), Actual Amount	$ 250,568	$ 243,679
Tier I Capital (to risk weighted assets), Actual Ratio	0.107	0.121
Total Capital (to risk weighted assets), Actual Amount	$ 301,774	$ 256,753
Total Capital (to risk weighted assets), Actual Ratio	0.129	0.127
Tier I Capital (to average assets), Actual Amount	$ 250,568	$ 243,679
Tier I Capital (to average assets), Actual Ratio	0.087	0.105
Summit Community [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
CET1 (to risk weighted assets), Actual Amount	$ 276,361	$ 244,045
CET1 (to risk weighted assets), Actual Ratio	0.118	0.121
CET1 (to risk weighted assets), Minimum Required Capital, Amount	$ 163,943	$ 141,183
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	$ 152,233	$ 131,099
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	$ 276,361	$ 244,045
Tier I Capital (to risk weighted assets), Actual Ratio	0.118	0.121
Tier I Capital (to risk weighted assets), Minimum Required Capital, Amount	$ 199,074	$ 171,437
Tier I Capital (to risk weighted assets), Minimum Required Capital, Ratio	0.085	0.085
Tier I Capital (to risk weighted assets), Minimum Required To Be Well Capitalized, Amount	$ 187,363	$ 161,352
Tier I Capital (to risk weighted assets), Minimum Required To Be Well Capitalized, Ratio	0.080	0.080
Total Capital (to risk weighted assets), Actual Amount	$ 297,567	$ 257,119
Total Capital (to risk weighted assets), Actual Ratio	0.127	0.127
Total Capital (to risk weighted assets), Minimum Required Capital, Amount	$ 246,020	$ 212,579
Total Capital (to risk weighted assets), Minimum Required Capital, Ratio	0.105	0.105
Total Capital (to risk weighted assets), Minimum Required To Be Well Capitalized, Amount	$ 234,305	$ 202,456
Total Capital (to risk weighted assets), Minimum Required To Be Well Capitalized, Ratio	0.100	0.100
Tier I Capital (to average assets), Actual Amount	$ 276,361	$ 244,045
Tier I Capital (to average assets), Actual Ratio	0.096	0.106
Tier I Capital (to average assets), Minimum Required Capital, Amount	$ 115,150	$ 92,092
Tier I Capital (to average assets), Minimum Required Capital, Ratio	0.040	0.040
Tier I Capital (to average assets), Minimum Required To Be Well Capitalized, Amount	$ 143,938	$ 115,116
Tier I Capital (to average assets), Minimum Required To Be Well Capitalized, Ratio	0.050	0.050