Regulatory Matters (Summary Of Actual Capital Amounts And Ratios) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Summit [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
CET1 (to risk weighted assets), Actual Amount	$ 192,823	$ 177,010
CET1 (to risk weighted assets), Actual Ratio	11.10%	10.60%
CET1 (to risk weighted assets), Minimum Required Capital, Amount		$ 116,893
CET1 (to risk weighted assets), Minimum Required Capital, Ratio		7.00%
CET1 (to risk weighted assets), Minimum Required To Be Well Capitalized, Amount		$ 108,544
CET1 (to risk weighted assets), Minimum Required To Be Well Capitalized, Ratio		6.50%
Tier I Capital (to risk weighted assets), Actual Amount	$ 211,823	$ 196,010
Tier I Capital (to risk weighted assets), Actual Ratio	12.20%	11.80%
Tier I Capital (to risk weighted assets), Minimum Required Capital, Amount		$ 141,194
Tier I Capital (to risk weighted assets), Minimum Required Capital, Ratio		8.50%
Tier I Capital (to risk weighted assets), Minimum Required To Be Well Capitalized, Amount		$ 132,888
Tier I Capital (to risk weighted assets), Minimum Required To Be Well Capitalized, Ratio		8.00%
Total Capital (to risk weighted assets), Actual Amount	$ 224,767	$ 208,575
Total Capital (to risk weighted assets), Actual Ratio	12.90%	12.50%
Total Capital (to risk weighted assets), Minimum Required Capital, Amount		$ 175,203
Total Capital (to risk weighted assets), Minimum Required Capital, Ratio		10.50%
Total Capital (to risk weighted assets), Minimum Required To Be Well Capitalized, Amount		$ 166,860
Total Capital (to risk weighted assets), Minimum Required To Be Well Capitalized, Ratio		10.00%
Tier I Capital (to average assets), Actual Amount	$ 211,823	$ 196,010
Tier I Capital (to average assets), Actual Ratio	10.10%	9.40%
Tier I Capital (to average assets), Minimum Required Capital, Amount		$ 83,409
Tier I Capital (to average assets), Minimum Required Capital, Ratio		4.00%
Tier I Capital (to average assets), Minimum Required To Be Well Capitalized, Amount		$ 104,261
Tier I Capital (to average assets), Minimum Required To Be Well Capitalized, Ratio		5.00%
Summit Community [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
CET1 (to risk weighted assets), Actual Amount	$ 207,725	$ 195,008
CET1 (to risk weighted assets), Actual Ratio	12.00%	11.70%
CET1 (to risk weighted assets), Minimum Required Capital, Amount	$ 121,173	$ 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	$ 112,518	$ 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	$ 207,725	$ 195,008
Tier I Capital (to risk weighted assets), Actual Ratio	12.00%	11.70%
Tier I Capital (to risk weighted assets), Minimum Required Capital, Amount	$ 147,139	$ 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	$ 138,483	$ 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	$ 220,669	$ 207,573
Total Capital (to risk weighted assets), Actual Ratio	12.70%	12.50%
Total Capital (to risk weighted assets), Minimum Required Capital, Amount	$ 182,443	$ 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	$ 173,755	$ 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	$ 207,725	$ 195,008
Tier I Capital (to average assets), Actual Ratio	9.90%	9.40%
Tier I Capital (to average assets), Minimum Required Capital, Amount	$ 83,929	$ 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	$ 104,912	$ 103,728
Tier I Capital (to average assets), Minimum Required To Be Well Capitalized, Ratio	5.00%	5.00%