Regulatory Matters (Summary Of Actual Capital Amounts And Ratios) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Summit [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
CET1 (to risk weighted assets), Actual Amount	$ 181,567	$ 177,010
CET1 (to risk weighted assets), Actual Ratio	10.70%	10.60%
CET1 (to risk weighted assets), Minimum Required Capital, Amount	$ 118,782	$ 116,893
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	$ 110,298	$ 108,544
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	$ 200,567	$ 196,010
Tier I Capital (to risk weighted assets), Actual Ratio	11.80%	11.80%
Tier I Capital (to risk weighted assets), Minimum Required Capital, Amount	$ 144,476	$ 141,194
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	$ 135,978	$ 132,888
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	$ 212,825	$ 208,575
Total Capital (to risk weighted assets), Actual Ratio	12.50%	12.50%
Total Capital (to risk weighted assets), Minimum Required Capital, Amount	$ 178,773	$ 175,203
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	$ 170,260	$ 166,860
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	$ 200,567	$ 196,010
Tier I Capital (to average assets), Actual Ratio	9.50%	9.40%
Tier I Capital (to average assets), Minimum Required Capital, Amount	$ 84,449	$ 83,409
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	$ 105,562	$ 104,261
Tier I Capital (to average assets), Minimum Required To Be Well Capitalized, Ratio	5.00%	5.00%
Summit Community [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
CET1 (to risk weighted assets), Actual Amount	$ 199,727	$ 195,008
CET1 (to risk weighted assets), Actual Ratio	11.70%	11.70%
CET1 (to risk weighted assets), Minimum Required Capital, Amount	$ 119,495	$ 116,671
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	$ 110,959	$ 108,338
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	$ 199,727	$ 195,008
Tier I Capital (to risk weighted assets), Actual Ratio	11.70%	11.70%
Tier I Capital (to risk weighted assets), Minimum Required Capital, Amount	$ 145,101	$ 141,672
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	$ 136,565	$ 133,339
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	$ 211,985	$ 207,573
Total Capital (to risk weighted assets), Actual Ratio	12.50%	12.50%
Total Capital (to risk weighted assets), Minimum Required Capital, Amount	$ 178,067	$ 174,361
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	$ 169,588	$ 166,058
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	$ 199,727	$ 195,008
Tier I Capital (to average assets), Actual Ratio	9.50%	9.40%
Tier I Capital (to average assets), Minimum Required Capital, Amount	$ 84,096	$ 82,982
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	$ 105,119	$ 103,728
Tier I Capital (to average assets), Minimum Required To Be Well Capitalized, Ratio	5.00%	5.00%