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Note 13 - Regulatory Capital - Capital Regulatory Ratios (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Capital $ 261,759 $ 262,964    
Capital to risk-weighted assets 12.37% 15.03%    
Capital required for capital adequacy $ 169,251 $ 140,009    
Capital required for capital adequacy to risk-weighted assets 8.00% 8.00%    
Capital required for capital adequacy, with capital buffer $ 222,141 $ 172,824    
Total capital (to risk-weighted assets) 10.50% 9.875% 9.25% 8.625%
Capital required to be well capitalized    
Capital required to be well capitalized to risk-weighted assets    
Tier one risk-based capital $ 252,493 $ 254,349    
Tier one risk-based capital to risk-weighted assets 11.93% 14.53%    
Tier one risk-based capital required for capital adequacy $ 126,938 $ 105,007    
Tier one risk-based capital required for capital adequacy to risk-weighted assets 6.00% 6.00%    
Tier one risk-based capital required for capital adequacy, with capital buffer $ 179,829 $ 137,821    
Tier 1 capital (to risk weighted assets) 8.50% 7.875% 7.25% 6.625%
Tier one risk-based capital required to be well capitalized    
Tier one risk-based capital required to be well capitalized to risk-weighted assets    
Common equity tier one risk-based capital $ 241,493 $ 243,349    
Common equity tier one risk-based capital to risk-weighted assets 11.41% 13.90%    
Common equity tier one risk-based capital required for capital adequacy $ 95,203 $ 78,755    
Common equity tier one risk-based capital required for capital adequacy to risk-weighted assets 4.50% 4.50%    
Common equity tier one risk-based capital required for capital adequacy, with capital buffer $ 148,094 $ 111,570    
Common equity tier 1 capital (CET1) 7.00% 6.375% 5.75% 5.125%
Common equity tier one risk-based capital required to be well capitalized    
Common equity tier one risk-based capital required to be well capitalized to risk-weighted assets    
Tier one leverage capital $ 249,168 $ 254,349    
Tier one leverage capital to average assets 7.83% 9.35%    
Tier one leverage capital required for capital adequacy $ 129,058 $ 108,800    
Tier one leverage capital required for capital adequacy to risk average assets 4.00% 4.00%    
Tier one leverage capital required for capital adequacy, with capital buffer $ 129,058 $ 108,800    
Tier one leverage capitalrequired for capital adequacy to average assets, with capital buffer 4.00% 4.00%    
Tier one leverage capitalrequired to be well capitalized    
Tier one leverage capitalrequired to be well capitalized to average assets    
Subsidiaries [Member]        
Capital $ 252,307 $ 231,610    
Capital to risk-weighted assets 11.94% 13.26%    
Capital required for capital adequacy $ 169,016 $ 139,722    
Capital required for capital adequacy to risk-weighted assets 8.00% 8.00%    
Capital required for capital adequacy, with capital buffer $ 221,833 $ 172,489    
Total capital (to risk-weighted assets) 10.50% 9.875%    
Capital required to be well capitalized $ 211,270 $ 174,652    
Capital required to be well capitalized to risk-weighted assets 10.00% 10.00%    
Tier one risk-based capital $ 243,041 $ 222,995    
Tier one risk-based capital to risk-weighted assets 11.50% 12.77%    
Tier one risk-based capital required for capital adequacy $ 126,762 $ 104,791    
Tier one risk-based capital required for capital adequacy to risk-weighted assets 6.00% 6.00%    
Tier one risk-based capital required for capital adequacy, with capital buffer $ 179,579 $ 137,539    
Tier 1 capital (to risk weighted assets) 8.50% 7.875%    
Tier one risk-based capital required to be well capitalized $ 169,016 $ 139,722    
Tier one risk-based capital required to be well capitalized to risk-weighted assets 8.00% 8.00%    
Common equity tier one risk-based capital $ 243,041 $ 222,995    
Common equity tier one risk-based capital to risk-weighted assets 11.50% 12.77%    
Common equity tier one risk-based capital required for capital adequacy $ 95,071 $ 78,594    
Common equity tier one risk-based capital required for capital adequacy to risk-weighted assets 4.50% 4.50%    
Common equity tier one risk-based capital required for capital adequacy, with capital buffer $ 147,889 $ 111,341    
Common equity tier 1 capital (CET1) 7.00% 6.375%    
Common equity tier one risk-based capital required to be well capitalized $ 137,325 $ 113,524    
Common equity tier one risk-based capital required to be well capitalized to risk-weighted assets 6.50% 6.50%    
Tier one leverage capital $ 245,158 $ 222,995    
Tier one leverage capital to average assets 7.54% 8.21%    
Tier one leverage capital required for capital adequacy $ 128,935 $ 108,685    
Tier one leverage capital required for capital adequacy to risk average assets 4.00% 4.00%    
Tier one leverage capital required for capital adequacy, with capital buffer $ 128,935 $ 108,685    
Tier one leverage capitalrequired for capital adequacy to average assets, with capital buffer 4.00% 4.00%    
Tier one leverage capitalrequired to be well capitalized $ 161,169 $ 135,857    
Tier one leverage capitalrequired to be well capitalized to average assets 5.00% 5.00%