Regulatory Matters (Summary Of Actual Capital Amounts And Ratios) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Summit [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
CET1 (to risk weighted assets), Actual Amount	$ 212,502	$ 197,551
CET1 (to risk weighted assets), Actual Ratio	11.10%	11.10%
Tier I Capital (to risk weighted assets), Actual Amount	$ 231,502	$ 216,551
Tier I Capital (to risk weighted assets), Actual Ratio	12.10%	12.20%
Total Capital (to risk weighted assets), Actual Amount	$ 244,654	$ 229,598
Total Capital (to risk weighted assets), Actual Ratio	12.80%	12.90%
Tier I Capital (to average assets), Actual Amount	$ 231,502	$ 216,551
Tier I Capital (to average assets), Actual Ratio	10.40%	10.10%
Summit Community [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
CET1 (to risk weighted assets), Actual Amount	$ 228,143	$ 213,930
CET1 (to risk weighted assets), Actual Ratio	11.90%	12.00%
CET1 (to risk weighted assets), Minimum Required Capital, Amount	$ 134,202	$ 124,793
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	$ 124,616	$ 115,879
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	$ 228,143	$ 213,930
Tier I Capital (to risk weighted assets), Actual Ratio	11.90%	12.00%
Tier I Capital (to risk weighted assets), Minimum Required Capital, Amount	$ 162,959	$ 151,534
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	$ 153,373	$ 142,620
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	$ 241,295	$ 226,977
Total Capital (to risk weighted assets), Actual Ratio	12.60%	12.80%
Total Capital (to risk weighted assets), Minimum Required Capital, Amount	$ 201,079	$ 186,192
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	$ 191,504	$ 177,326
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	$ 228,143	$ 213,930
Tier I Capital (to average assets), Actual Ratio	10.20%	10.00%
Tier I Capital (to average assets), Minimum Required Capital, Amount	$ 89,468	$ 85,572
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	$ 111,835	$ 106,965
Tier I Capital (to average assets), Minimum Required To Be Well Capitalized, Ratio	5.00%	5.00%