Note 19 - Regulatory Matters - Summary of Actual Capital Amounts And Ratios (Details) $ in Thousands	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Summit [Member]
CET1 (to risk weighted assets), amount	$ 299,993	$ 257,122
CET1 (to risk weighted assets), Actual Ratio	0.086	0.084
CET1 (to risk weighted assets), Minimum Required Capital, Amount	$ 245,141	$ 214,268
CET1 (to risk weighted assets), Minimum Required Capital, Ratio	0.070	0.070
Tier I Capital (to risk weighted assets), amount	$ 333,913	$ 291,042
Tier I Capital (to risk weighted assets), Actual Ratio	0.095	0.095
Tier I Capital (to risk weighted assets), Minimum Required Capital, Amount	$ 297,672	$ 260,406
Tier I Capital (to risk weighted assets), Minimum Required Capital, Ratio	0.085	0.085
Total Capital (to risk weighted assets), amount	$ 472,955	$ 420,045
Total Capital (to risk weighted assets), Actual Ratio	0.135	0.138
Total Capital (to risk weighted assets), Minimum Required Capital, Amount	$ 367,712	$ 319,599
Total Capital (to risk weighted assets), Minimum Required Capital, Ratio	0.105	0.105
Tier I Capital (to average assets), amount	$ 333,913	$ 291,042
Tier I Capital (to average assets), Actual Amount	0.085	0.083
Tier I Capital (to average assets), Minimum Required Capital, Amount	$ 156,852	$ 140,261
Tier I Capital (to average assets), Minimum Required Capital, Ratio	0.040	0.040
Summit Community [Member]
CET1 (to risk weighted assets), amount	$ 405,430	$ 364,125
CET1 (to risk weighted assets), Actual Ratio	0.116	0.119
CET1 (to risk weighted assets), Minimum Required Capital, Amount	$ 244,502	$ 214,191
CET1 (to risk weighted assets), Minimum Required Capital, Ratio	0.070	0.070
CET1 (to risk weighted assets), Minimum Required To Be Well Capitalized, Amount	$ 227,038	$ 198,892
CET1 (to risk weighted assets), Minimum Required To Be Well Capitalized, Ratio	0.065	0.065
Tier I Capital (to risk weighted assets), amount	$ 405,430	$ 364,125
Tier I Capital (to risk weighted assets), Actual Ratio	0.116	0.119
Tier I Capital (to risk weighted assets), Minimum Required Capital, Amount	$ 296,896	$ 260,089
Tier I Capital (to risk weighted assets), Minimum Required Capital, Ratio	0.085	0.085
Tier I Capital (to risk weighted assets), Minimum Required To Be Well Capitalized, Amount	$ 279,431	$ 244,790
Tier I Capital (to risk weighted assets), Minimum Required To Be Well Capitalized, Ratio	0.080	0.080
Total Capital (to risk weighted assets), amount	$ 441,177	$ 390,236
Total Capital (to risk weighted assets), Actual Ratio	0.126	0.128
Total Capital (to risk weighted assets), Minimum Required Capital, Amount	$ 366,754	$ 320,115
Total Capital (to risk weighted assets), Minimum Required Capital, Ratio	0.105	0.105
Total Capital (to risk weighted assets), Minimum Required To Be Well Capitalized, Amount	$ 349,289	$ 304,872
Total Capital (to risk weighted assets), Minimum Required To Be Well Capitalized, Ratio	0.100	0.100
Tier I Capital (to average assets), amount	$ 405,430	$ 364,125
Tier I Capital (to average assets), Actual Amount	0.104	0.104
Tier I Capital (to average assets), Minimum Required Capital, Amount	$ 156,338	$ 140,048
Tier I Capital (to average assets), Minimum Required Capital, Ratio	0.040	0.040
Tier I Capital (to average assets), Minimum Required To Be Well Capitalized, Amount	$ 195,422	$ 175,060
Tier I Capital (to average assets), Minimum Required To Be Well Capitalized, Ratio	0.050	0.050