Note 20 - Regulatory Matters - Actual Capital Levels and Minimum Levels (Details) $ in Thousands	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Total capital minimum required for capital adequacy, ratio	0.105
Tier 1 capital minimum required for capital adequacy, ratio	0.085
Common equity tier 1 capital minimum required for capital adequacy, ratio	0.07
Consolidated Entities [Member]
Total capital, amount	$ 710,905	$ 634,729
Total capital, ratio	0.137	0.14
Total capital minimum required for capital adequacy, amount	$ 415,841	$ 362,675
Total capital minimum required for capital adequacy, ratio	0.08	0.08
Tier 1 capital, amount	$ 570,730	$ 503,855
Tier 1 capital, ratio	0.11	0.111
Tier 1 capital minimum required for capital adequacy, amount	$ 311,881	$ 272,007
Tier 1 capital minimum required for capital adequacy, ratio	0.06	0.06
Common equity tier 1, amount	$ 523,160	$ 456,970
Common equity tier 1, ratio	0.101	0.101
Common equity tier 1 minimum required for capital adequacy, amount	$ 233,911	$ 204,005
Common equity tier 1 capital minimum required for capital adequacy, ratio	0.045	0.045
Tier 1 capital to average assets, amount	$ 570,730	$ 503,855
Tier 1 capital to average assets, ratio	0.108	0.101
Tier 1 capital to average assets, minimum required for capital adequacy, amount	$ 210,527	$ 199,647
Tier 1 capital to average assets minimum required for capital adequacy, ratio	0.04	0.04
Bank [Member]
Total capital, amount	$ 694,431	$ 618,709
Total capital, ratio	0.134	0.137
Total capital minimum required for capital adequacy, amount	$ 414,019	$ 362,490
Total capital minimum required for capital adequacy, ratio	0.08	0.08
Total capital to be well capitalized, amount	$ 517,524	$ 453,112
Total capital to be well capitalized, ratio	0.10	0.10
Tier 1 capital, amount	$ 643,227	$ 576,463
Tier 1 capital, ratio	0.124	0.127
Tier 1 capital minimum required for capital adequacy, amount	$ 310,514	$ 271,868
Tier 1 capital minimum required for capital adequacy, ratio	0.06	0.06
Tier 1 capital to be well capitalized, amount	$ 414,019	$ 362,490
Tier 1 capital to be well capitalized, ratio	0.08	0.08
Common equity tier 1, amount	$ 643,227	$ 576,463
Common equity tier 1, ratio	0.124	0.127
Common equity tier 1 minimum required for capital adequacy, amount	$ 232,886	$ 203,901
Common equity tier 1 capital minimum required for capital adequacy, ratio	0.045	0.045
Common equity tier 1 capital to be well capitalized, amount	$ 336,391	$ 294,523
Common equity tier 1 capital to be well capitalized, ratio	0.065	0.065
Tier 1 capital to average assets, amount	$ 643,227	$ 576,463
Tier 1 capital to average assets, ratio	0.122	0.116
Tier 1 capital to average assets, minimum required for capital adequacy, amount	$ 210,427	$ 199,563
Tier 1 capital to average assets minimum required for capital adequacy, ratio	0.04	0.04
Tier 1 capital to average assets to be well capitalized, amount	$ 263,034	$ 249,453
Tier 1 capital to average assets to be well capitalized, ratio	0.05	0.05