Note 19 - Regulatory Matters - Summary of Actual Capital Amounts And Ratios (Details) $ in Thousands	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Summit [Member]
CET1 (to risk weighted assets), amount	$ 369,935	$ 299,993
CET1 (to risk weighted assets), Actual Ratio	0.091	0.086
CET1 (to risk weighted assets), Minimum Required Capital, Amount	$ 285,338	$ 245,141
CET1 (to risk weighted assets), Minimum Required Capital, Ratio	0.07	0.07
Tier I Capital (to risk weighted assets), amount	$ 403,855	$ 333,913
Tier I Capital (to risk weighted assets), Actual Ratio	0.099	0.095
Tier I Capital (to risk weighted assets), Minimum Required Capital, Amount	$ 346,481	$ 297,672
Tier I Capital (to risk weighted assets), Minimum Required Capital, Ratio	0.085	0.085
Total Capital (to risk weighted assets), amount	$ 556,590	$ 472,955
Total Capital (to risk weighted assets), Actual Ratio	0.137	0.135
Total Capital (to risk weighted assets), Minimum Required Capital, Amount	$ 428,006	$ 367,712
Total Capital (to risk weighted assets), Minimum Required Capital, Ratio	0.105	0.105
Tier I Capital (to average assets), amount	$ 403,855	$ 333,913
Tier I Capital (to average assets), Actual Amount	0.087	0.085
Tier I Capital (to average assets), Minimum Required Capital, Amount	$ 186,747	$ 156,852
Tier I Capital (to average assets), Minimum Required Capital, Ratio	0.04	0.04
Summit Community [Member]
CET1 (to risk weighted assets), amount	$ 475,785	$ 405,430
CET1 (to risk weighted assets), Actual Ratio	0.117	0.116
CET1 (to risk weighted assets), Minimum Required Capital, Amount	$ 284,873	$ 244,502
CET1 (to risk weighted assets), Minimum Required Capital, Ratio	0.07	0.07
CET1 (to risk weighted assets), Minimum Required To Be Well Capitalized, Amount	$ 264,525	$ 227,038
CET1 (to risk weighted assets), Minimum Required To Be Well Capitalized, Ratio	0.065	0.065
Tier I Capital (to risk weighted assets), amount	$ 475,785	$ 405,430
Tier I Capital (to risk weighted assets), Actual Ratio	0.117	0.116
Tier I Capital (to risk weighted assets), Minimum Required Capital, Amount	$ 345,917	$ 296,896
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	$ 325,569	$ 279,431
Tier I Capital (to risk weighted assets), Minimum Required To Be Well Capitalized, Ratio	0.08	0.08
Total Capital (to risk weighted assets), amount	$ 524,737	$ 441,177
Total Capital (to risk weighted assets), Actual Ratio	0.129	0.126
Total Capital (to risk weighted assets), Minimum Required Capital, Amount	$ 427,309	$ 366,754
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	$ 406,961	$ 349,289
Total Capital (to risk weighted assets), Minimum Required To Be Well Capitalized, Ratio	0.10	0.10
Tier I Capital (to average assets), amount	$ 475,785	$ 405,430
Tier I Capital (to average assets), Actual Amount	0.102	0.104
Tier I Capital (to average assets), Minimum Required Capital, Amount	$ 186,057	$ 156,338
Tier I Capital (to average assets), Minimum Required Capital, Ratio	0.04	0.04
Tier I Capital (to average assets), Minimum Required To Be Well Capitalized, Amount	$ 232,571	$ 195,422
Tier I Capital (to average assets), Minimum Required To Be Well Capitalized, Ratio	0.05	0.05