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Note 12 - Regulatory Matters - Actual Capital Levels and Minimum Levels (Details)
$ in Thousands
Jun. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
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 0.070  
Consolidated Entities [Member]    
Total capital, amount $ 481,324 $ 468,113
Total capital, ratio 0.131 0.138
Total capital minimum required for capital adequacy, amount $ 294,175 $ 271,325
Total capital minimum required for capital adequacy, ratio 0.080 0.080
Tier 1 capital, amount $ 445,410 $ 430,146
Tier 1 capital, ratio 0.121 0.127
Tier 1 capital minimum required for capital adequacy, amount $ 220,631 $ 203,494
Tier 1 capital minimum required for capital adequacy, ratio 0.060 0.060
Common equity tier 1, amount $ 399,581 $ 384,658
Common equity tier 1, ratio 0.109 0.113
Common equity tier 1 minimum required for capital adequacy, amount $ 165,474 $ 152,621
Common equity tier 1 capital minimum required for capital adequacy, ratio 0.045 0.045
Tier 1 capital to average assets, amount $ 445,410 $ 430,146
Tier 1 capital to average assets, ratio 0.095 0.098
Tier 1 capital to average assets, minimum required for capital adequacy, amount $ 188,065 $ 176,053
Tier 1 capital to average assets minimum required for capital adequacy, ratio 0.040 0.040
Bank [Member]    
Total capital, amount $ 477,684 $ 457,203
Total capital, ratio 0.130 0.135
Total capital minimum required for capital adequacy, amount $ 293,957 $ 271,196
Total capital minimum required for capital adequacy, ratio 0.080 0.080
Total capital to be well capitalized, amount $ 367,447 $ 338,995
Total capital to be well capitalized, ratio 0.100 0.100
Tier 1 capital, amount $ 441,770 $ 419,236
Tier 1 capital, ratio 0.120 0.124
Tier 1 capital minimum required for capital adequacy, amount $ 220,468 $ 203,397
Tier 1 capital minimum required for capital adequacy, ratio 0.060 0.060
Tier 1 capital to be well capitalized, amount $ 293,957 $ 271,196
Tier 1 capital to be well capitalized, ratio 0.080 0.080
Common equity tier 1, amount $ 441,770 $ 419,236
Common equity tier 1, ratio 0.120 0.124
Common equity tier 1 minimum required for capital adequacy, amount $ 165,351 $ 152,548
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 $ 238,841 $ 220,347
Common equity tier 1 capital to be well capitalized, ratio 0.065 0.065
Tier 1 capital to average assets, amount $ 441,770 $ 419,236
Tier 1 capital to average assets, ratio 0.094 0.095
Tier 1 capital to average assets, minimum required for capital adequacy, amount $ 187,971 $ 175,999
Tier 1 capital to average assets minimum required for capital adequacy, ratio 0.040 0.040
Tier 1 capital to average assets to be well capitalized, amount $ 234,964 $ 219,999
Tier 1 capital to average assets to be well capitalized, ratio 0.050 0.050