Regulatory Matters (Summary Of Actual Capital Amounts And Ratios) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Summit [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
CET1 (to risk weighted assets), Actual Amount	$ 231,676	$ 224,679
CET1 (to risk weighted assets), Actual Ratio	10.80%	11.10%
Tier I Capital (to risk weighted assets), Actual Amount	$ 250,676	$ 243,679
Tier I Capital (to risk weighted assets), Actual Ratio	11.70%	12.10%
Total Capital (to risk weighted assets), Actual Amount	$ 267,905	$ 256,753
Total Capital (to risk weighted assets), Actual Ratio	12.50%	12.70%
Tier I Capital (to average assets), Actual Amount	$ 250,676	$ 243,679
Tier I Capital (to average assets), Actual Ratio	10.20%	10.50%
Summit Community [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
CET1 (to risk weighted assets), Actual Amount	$ 250,530	$ 244,045
CET1 (to risk weighted assets), Actual Ratio	11.70%	12.10%
CET1 (to risk weighted assets), Minimum Required Capital, Amount	$ 149,890	$ 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	$ 139,183	$ 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	$ 250,530	$ 244,045
Tier I Capital (to risk weighted assets), Actual Ratio	11.70%	12.10%
Tier I Capital (to risk weighted assets), Minimum Required Capital, Amount	$ 182,009	$ 171,437
Tier I Capital (to risk weighted assets), Minimum Required Capital, Ratio	8.50%	8.50%
Tier I Capital (to risk weighted assets), Minimum Required To Be Well Capitalized, Amount	$ 171,303	$ 161,352
Tier I Capital (to risk weighted assets), Minimum Required To Be Well Capitalized, Ratio	8.00%	8.00%
Total Capital (to risk weighted assets), Actual Amount	$ 267,759	$ 257,119
Total Capital (to risk weighted assets), Actual Ratio	12.50%	12.70%
Total Capital (to risk weighted assets), Minimum Required Capital, Amount	$ 224,918	$ 212,579
Total Capital (to risk weighted assets), Minimum Required Capital, Ratio	10.50%	10.50%
Total Capital (to risk weighted assets), Minimum Required To Be Well Capitalized, Amount	$ 214,207	$ 202,456
Total Capital (to risk weighted assets), Minimum Required To Be Well Capitalized, Ratio	10.00%	10.00%
Tier I Capital (to average assets), Actual Amount	$ 250,530	$ 244,045
Tier I Capital (to average assets), Actual Ratio	10.20%	10.60%
Tier I Capital (to average assets), Minimum Required Capital, Amount	$ 98,247	$ 92,092
Tier I Capital (to average assets), Minimum Required Capital, Ratio	4.00%	4.00%
Tier I Capital (to average assets), Minimum Required To Be Well Capitalized, Amount	$ 122,809	$ 115,116
Tier I Capital (to average assets), Minimum Required To Be Well Capitalized, Ratio	5.00%	5.00%