Regulatory Matters (Summary Of Actual Capital Amounts And Ratios) (Details) $ in Thousands	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Summit [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common Equity Tier One Capital	$ 257,122	$ 233,768
Common Equity Tier One Capital Ratio	0.084	0.093
Common Equity Tier One Capital Required for Capital Adequacy	$ 214,268
Tier One Common Equity Required for Capital Adequacy to Risk Weighted Assets	7.00%
Tier I Capital (to risk weighted assets ), Actual Amount	$ 291,042	$ 252,768
Tier I Capital (to risk weighted assets), Actual Ratio	0.095	0.100
Tier I Capital (to risk weighted assets), Minimum Required Regulatory Capital, Amount	$ 260,406
Tier I Capital (to risk weighted assets), Minimum Required Regulatory Capital, Ratio	0.085
Total Capital (to risk weighted assets), Actual Amount	$ 420,045	$ 305,309
Total Capital (to risk weighted assets), Actual Ratio	0.138	0.121
Total Capital (to risk weighted assets), Minimum Required Regulatory Capital, Amount	$ 319,599
Total Capital (to risk weighted assets), Minimum Required Regulatory Capital, Ratio	0.105
Tier I Capital (to average assets), Actual Amount	$ 291,042	$ 252,768
Tier I Capital (to average assets), Actual Ratio	0.083	0.086
Tier I Capital (to average assets), Minimum Required Regulatory Capital, Amount	$ 140,261
Tier I Capital (to average assets), Minimum Required Regulatory Capital, Ratio	0.040
Summit Community [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common Equity Tier One Capital	$ 364,125	$ 279,540
Common Equity Tier One Capital Ratio	0.119	0.111
Common Equity Tier One Capital Required for Capital Adequacy	$ 214,191	$ 176,286
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	$ 198,892	$ 163,695
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	$ 364,125	$ 279,540
Tier I Capital (to risk weighted assets), Actual Ratio	0.119	0.111
Tier I Capital (to risk weighted assets), Minimum Required Regulatory Capital, Amount	$ 260,089	$ 214,062
Tier I Capital (to risk weighted assets), Minimum Required Regulatory Capital, Ratio	0.085	0.085
Tier I Capital (to risk weighted assets), To be Well Capitalized under Prompt Corrective Action Provisions, Amount	$ 244,790	$ 201,470
Tier I Capital (to risk weighted assets), To be Well Capitalized under Prompt Corrective Action Provisions, Ratio	0.080	0.080
Total Capital (to risk weighted assets), Actual Amount	$ 390,236	$ 302,716
Total Capital (to risk weighted assets), Actual Ratio	0.128	0.120
Total Capital (to risk weighted assets), Minimum Required Regulatory Capital, Amount	$ 320,115	$ 264,877
Total Capital (to risk weighted assets), Minimum Required Regulatory Capital, Ratio	0.105	0.105
Total Capital (to risk weighted assets), To be Well Capitalized under Prompt Corrective Action Provisions, Amount	$ 304,872	$ 252,263
Total Capital (to risk weighted assets), To be Well Capitalized under Prompt Corrective Action Provisions, Ratio	0.100	0.100
Tier I Capital (to average assets), Actual Amount	$ 364,125	$ 279,540
Tier I Capital (to average assets), Actual Ratio	0.104	0.095
Tier I Capital (to average assets), Minimum Required Regulatory Capital, Amount	$ 140,048	$ 117,701
Tier I Capital (to average assets), Minimum Required Regulatory Capital, Ratio	0.040	0.040
Tier I Capital (to average assets), To be Well Capitalized under Prompt Corrective Action Provisions, Amount	$ 175,060	$ 147,126
Tier I Capital (to average assets), To be Well Capitalized under Prompt Corrective Action Provisions, Ratio	0.050	0.050