Regulatory Matters (Summary Of Actual Capital Amounts And Ratios) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Summit [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
CET1 (to risk weighted assets), Actual Amount	$ 134,357
CET1 (to risk weighted assets), Actual Ratio	11.70%
CET1 (to risk weighted assets), Minimum Required Capital, Amount	$ 80,385
CET1 (to risk weighted assets), Minimum Required Capital, Ratio	7.00%
CET1 (to risk weighted assets), Minimum Required To Be Well Capitalized, Amount	$ 74,643
CET1 (to risk weighted assets), Minimum Required To Be Well Capitalized, Ratio	6.50%
Tier I Capital (to risk weighted assets), Actual Amount	$ 153,357	$ 141,589
Tier I Capital (to risk weighted assets), Actual Ratio	13.40%	13.30%
Tier I Capital (to risk weighted assets), Minimum Required Capital, Amount	$ 97,279	$ 42,583
Tier I Capital (to risk weighted assets), Minimum Required Capital, Ratio	8.50%	4.00%
Tier I Capital (to risk weighted assets), Minimum Required To Be Well Capitalized, Amount	$ 91,556	$ 63,875
Tier I Capital (to risk weighted assets), Minimum Required To Be Well Capitalized, Ratio	8.00%	6.00%
Total Capital (to risk weighted assets), Actual Amount	$ 164,585	$ 158,196
Total Capital (to risk weighted assets), Actual Ratio	14.40%	14.90%
Total Capital (to risk weighted assets), Minimum Required Capital, Amount	$ 120,010	$ 84,937
Total Capital (to risk weighted assets), Minimum Required Capital, Ratio	10.50%	8.00%
Total Capital (to risk weighted assets), Minimum Required To Be Well Capitalized, Amount	$ 114,295	$ 106,172
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	$ 153,357	$ 141,589
Tier I Capital (to average assets), Actual Ratio	10.50%	9.90%
Tier I Capital (to average assets), Minimum Required Capital, Amount	$ 58,422	$ 57,208
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	$ 73,027	$ 71,510
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	$ 155,528
CET1 (to risk weighted assets), Actual Ratio	13.60%
CET1 (to risk weighted assets), Minimum Required Capital, Amount	$ 80,051
CET1 (to risk weighted assets), Minimum Required Capital, Ratio	7.00%
CET1 (to risk weighted assets), Minimum Required To Be Well Capitalized, Amount	$ 74,333
CET1 (to risk weighted assets), Minimum Required To Be Well Capitalized, Ratio	6.50%
Tier I Capital (to risk weighted assets), Actual Amount	$ 155,528	$ 150,653
Tier I Capital (to risk weighted assets), Actual Ratio	13.60%	14.20%
Tier I Capital (to risk weighted assets), Minimum Required Capital, Amount	$ 97,205	$ 42,437
Tier I Capital (to risk weighted assets), Minimum Required Capital, Ratio	8.50%	4.00%
Tier I Capital (to risk weighted assets), Minimum Required To Be Well Capitalized, Amount	$ 91,487	$ 63,656
Tier I Capital (to risk weighted assets), Minimum Required To Be Well Capitalized, Ratio	8.00%	6.00%
Total Capital (to risk weighted assets), Actual Amount	$ 166,756	$ 161,820
Total Capital (to risk weighted assets), Actual Ratio	14.60%	15.30%
Total Capital (to risk weighted assets), Minimum Required Capital, Amount	$ 119,927	$ 84,612
Total Capital (to risk weighted assets), Minimum Required Capital, Ratio	10.50%	8.00%
Total Capital (to risk weighted assets), Minimum Required To Be Well Capitalized, Amount	$ 114,216	$ 105,765
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	$ 155,528	$ 150,653
Tier I Capital (to average assets), Actual Ratio	10.70%	10.60%
Tier I Capital (to average assets), Minimum Required Capital, Amount	$ 58,141	$ 56,850
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	$ 72,677	$ 71,063
Tier I Capital (to average assets), Minimum Required To Be Well Capitalized, Ratio	5.00%	5.00%