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Note 20 - Regulatory Matters - Actual Capital Levels and Minimum Levels (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Total capital minimum required for capital adequacy, ratio 10.50%  
Tier 1 capital minimum required for capital adequacy, ratio 8.50%  
Common equity tier 1 capital minimum required for capital adequacy, ratio 7.00%  
Consolidated Entities [Member]    
Total capital, amount $ 429,038 $ 396,102
Total capital, ratio 13.10% 12.50%
Total capital minimum required for capital adequacy, amount $ 262,141 $ 253,413
Total capital minimum required for capital adequacy, ratio 8.00% 8.00%
Tier 1 capital, amount $ 405,148 $ 373,721
Tier 1 capital, ratio 12.40% 11.80%
Tier 1 capital minimum required for capital adequacy, amount $ 196,606 $ 190,060
Tier 1 capital minimum required for capital adequacy, ratio 6.00% 6.00%
Common equity tier 1, amount $ 360,342 $ 329,596
Common equity tier 1, ratio 11.00% 10.40%
Common equity tier 1 minimum required for capital adequacy, amount $ 147,454 $ 142,545
Common equity tier 1 capital minimum required for capital adequacy, ratio 4.50% 4.50%
Tier 1 capital to average assets, amount $ 405,148 $ 373,721
Tier 1 capital to average assets, ratio 11.30% 11.40%
Tier 1 capital to average assets, minimum required for capital adequacy, amount $ 143,689 $ 131,014
Tier 1 capital to average assets minimum required for capital adequacy, ratio 4.00% 4.00%
Bank [Member]    
Total capital, amount $ 424,917 $ 388,591
Total capital, ratio 13.00% 12.30%
Total capital minimum required for capital adequacy, amount $ 262,088 $ 253,225
Total capital minimum required for capital adequacy, ratio 8.00% 8.00%
Total capital to be well capitalized, amount $ 327,610 $ 316,531
Total capital to be well capitalized, ratio 10.00% 10.00%
Tier 1 capital, amount $ 401,027 $ 366,211
Tier 1 capital, ratio 12.20% 11.60%
Tier 1 capital minimum required for capital adequacy, amount $ 196,566 $ 189,919
Tier 1 capital minimum required for capital adequacy, ratio 6.00% 6.00%
Tier 1 capital to be well capitalized, amount $ 262,088 $ 253,225
Tier 1 capital to be well capitalized, ratio 8.00% 8.00%
Common equity tier 1, amount $ 401,027 $ 366,211
Common equity tier 1, ratio 12.20% 11.60%
Common equity tier 1 minimum required for capital adequacy, amount $ 147,425 $ 142,439
Common equity tier 1 capital minimum required for capital adequacy, ratio 4.50% 4.50%
Common equity tier 1 capital to be well capitalized, amount $ 212,947 $ 205,745
Common equity tier 1 capital to be well capitalized, ratio 6.50% 6.50%
Tier 1 capital to average assets, amount $ 401,027 $ 366,211
Tier 1 capital to average assets, ratio 11.20% 11.20%
Tier 1 capital to average assets, minimum required for capital adequacy, amount $ 143,670 $ 130,913
Tier 1 capital to average assets minimum required for capital adequacy, ratio 4.00% 4.00%
Tier 1 capital to average assets to be well capitalized, amount $ 179,588 $ 163,641
Tier 1 capital to average assets to be well capitalized, ratio 5.00% 5.00%