Regulatory Matters (Summary Of Actual Capital Amounts And Ratios) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Summit [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common Equity Tier One Capital	$ 197,551	$ 177,010
Common Equity Tier One Capital Ratio	11.10%	10.60%
Common Equity Tier One Capital Required for Capital Adequacy		$ 116,893
Tier One Common Equity Required for Capital Adequacy to Risk Weighted Assets		7.00%
Common Equity Tier One Capital Required to be Well-Capitalized		$ 108,544
Tier One Common Equity Required to be Well Capitalized to Risk Weighted Assets		6.50%
Tier I Capital (to risk weighted assets ), Actual Amount	$ 216,551	$ 196,010
Tier I Capital (to risk weighted assets), Actual Ratio	12.20%	11.80%
Tier I Capital (to risk weighted assets), Minimum Required Regulatory Capital, Amount		$ 141,194
Tier I Capital (to risk weighted assets), Minimum Required Regulatory Capital, Ratio		8.50%
Tier I Capital (to risk weighted assets), To be Well Capitalized under Prompt Corrective Action Provisions, Amount		$ 132,888
Tier I Capital (to risk weighted assets), To be Well Capitalized under Prompt Corrective Action Provisions, Ratio		8.00%
Total Capital (to risk weighted assets), Actual Amount	$ 229,598	$ 208,575
Total Capital (to risk weighted assets), Actual Ratio	12.90%	12.50%
Total Capital (to risk weighted assets), Minimum Required Regulatory Capital, Amount		$ 175,203
Total Capital (to risk weighted assets), Minimum Required Regulatory Capital, Ratio		10.50%
Total Capital (to risk weighted assets), To be Well Capitalized under Prompt Corrective Action Provisions, Amount		$ 166,860
Total Capital (to risk weighted assets), To be Well Capitalized under Prompt Corrective Action Provisions, Ratio		10.00%
Tier I Capital (to average assets), Actual Amount	$ 216,551	$ 196,010
Tier I Capital (to average assets), Actual Ratio	10.10%	9.40%
Tier I Capital (to average assets), Minimum Required Regulatory Capital, Amount		$ 83,409
Tier I Capital (to average assets), Minimum Required Regulatory Capital, Ratio		4.00%
Tier I Capital (to average assets), To be Well Capitalized under Prompt Corrective Action Provisions, Amount		$ 104,261
Tier I Capital (to average assets), To be Well Capitalized under Prompt Corrective Action Provisions, Ratio		5.00%
Summit Community [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common Equity Tier One Capital	$ 213,930	$ 195,008
Common Equity Tier One Capital Ratio	12.00%	11.70%
Common Equity Tier One Capital Required for Capital Adequacy	$ 124,793	$ 116,671
Tier One Common Equity Required for Capital Adequacy to Risk Weighted Assets	7.00%	7.00%
Common Equity Tier One Capital Required to be Well-Capitalized	$ 115,879	$ 108,338
Tier One Common Equity Required to be Well Capitalized to Risk Weighted Assets	6.50%	6.50%
Tier I Capital (to risk weighted assets ), Actual Amount	$ 213,930	$ 195,008
Tier I Capital (to risk weighted assets), Actual Ratio	12.00%	11.70%
Tier I Capital (to risk weighted assets), Minimum Required Regulatory Capital, Amount	$ 151,534	$ 141,672
Tier I Capital (to risk weighted assets), Minimum Required Regulatory Capital, Ratio	8.50%	8.50%
Tier I Capital (to risk weighted assets), To be Well Capitalized under Prompt Corrective Action Provisions, Amount	$ 142,620	$ 133,339
Tier I Capital (to risk weighted assets), To be Well Capitalized under Prompt Corrective Action Provisions, Ratio	8.00%	8.00%
Total Capital (to risk weighted assets), Actual Amount	$ 226,977	$ 207,573
Total Capital (to risk weighted assets), Actual Ratio	12.80%	12.50%
Total Capital (to risk weighted assets), Minimum Required Regulatory Capital, Amount	$ 186,192	$ 174,361
Total Capital (to risk weighted assets), Minimum Required Regulatory Capital, Ratio	10.50%	10.50%
Total Capital (to risk weighted assets), To be Well Capitalized under Prompt Corrective Action Provisions, Amount	$ 177,326	$ 166,058
Total Capital (to risk weighted assets), To be Well Capitalized under Prompt Corrective Action Provisions, Ratio	10.00%	10.00%
Tier I Capital (to average assets), Actual Amount	$ 213,930	$ 195,008
Tier I Capital (to average assets), Actual Ratio	10.00%	9.40%
Tier I Capital (to average assets), Minimum Required Regulatory Capital, Amount	$ 85,572	$ 82,982
Tier I Capital (to average assets), Minimum Required Regulatory Capital, Ratio	4.00%	4.00%
Tier I Capital (to average assets), To be Well Capitalized under Prompt Corrective Action Provisions, Amount	$ 106,965	$ 103,728
Tier I Capital (to average assets), To be Well Capitalized under Prompt Corrective Action Provisions, Ratio	5.00%	5.00%