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Note 13 - Regulatory Capital - Capital Regulatory Ratios (Details)
$ in Thousands
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Capital $ 326,554 $ 261,759
Capital to risk-weighted assets 0.1350 0.1237
Capital required for capital adequacy $ 193,498 $ 169,251
Capital required for capital adequacy to risk-weighted assets 0.0800 0.0800
Capital required for capital adequacy, with capital buffer $ 253,967 $ 222,141
Capital required for capital adequacy to risk-weighted assets, with capital buffer 10.50% 10.50%
Tier one risk-based capital $ 313,579 $ 252,493
Tier one risk-based capital to risk-weighted assets 0.1296 0.1193
Tier one risk-based capital required for capital adequacy $ 145,124 $ 126,938
Tier one risk-based capital required for capital adequacy to risk-weighted assets 0.0600 0.0600
Tier one risk-based capital required for capital adequacy, with capital buffer $ 205,592 $ 179,829
Tier one risk-based capital required for capital adequacy to risk-weighted assets, with capital buffer 8.50% 8.50%
Common equity tier one risk-based capital $ 254,254 $ 241,493
Common equity tier one risk-based capital to risk-weighted assets 0.1051 0.1141
Common equity tier one risk-based capital required for capital adequacy $ 108,843 $ 95,203
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 $ 169,311 $ 148,094
Common equity tier one risk-based capital required for capital adequacy to risk-weighted assets, with capital buffer 7.00% 7.00%
Tier one leverage capital $ 308,113 $ 249,168
Tier one leverage capital to average assets 0.0817 0.0783
Tier one leverage capital required for capital adequacy $ 153,621 $ 129,058
Tier one leverage capital required for capital adequacy to risk average assets 0.0400 0.0400
Tier one leverage capital required for capital adequacy, with capital buffer $ 153,621 $ 129,058
Tier one leverage capitalrequired for capital adequacy to average assets, with capital buffer 4.00% 4.00%
Subsidiaries [Member]    
Capital $ 298,291 $ 252,307
Capital to risk-weighted assets 0.1236 0.1194
Capital required for capital adequacy $ 193,062 $ 169,016
Capital required for capital adequacy to risk-weighted assets 0.0800 0.0800
Capital required for capital adequacy, with capital buffer $ 253,394 $ 221,833
Capital required for capital adequacy to risk-weighted assets, with capital buffer 10.50% 10.50%
Capital required to be well capitalized $ 241,327 $ 211,270
Capital required to be well capitalized to risk-weighted assets 0.1000 0.1000
Tier one risk-based capital $ 285,316 $ 243,041
Tier one risk-based capital to risk-weighted assets 0.1182 0.1150
Tier one risk-based capital required for capital adequacy $ 144,796 $ 126,762
Tier one risk-based capital required for capital adequacy to risk-weighted assets 0.0600 0.0600
Tier one risk-based capital required for capital adequacy, with capital buffer $ 205,128 $ 179,579
Tier one risk-based capital required for capital adequacy to risk-weighted assets, with capital buffer 8.50% 8.50%
Tier one risk-based capital required to be well capitalized $ 193,062 $ 169,016
Tier one risk-based capital required to be well capitalized to risk-weighted assets 0.0800 0.0800
Common equity tier one risk-based capital $ 285,316 $ 243,041
Common equity tier one risk-based capital to risk-weighted assets 0.1182 0.1150
Common equity tier one risk-based capital required for capital adequacy $ 108,597 $ 95,071
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 $ 168,929 $ 147,889
Common equity tier one risk-based capital required for capital adequacy to risk-weighted assets, with capital buffer 7.00% 7.00%
Common equity tier one risk-based capital required to be well capitalized $ 156,863 $ 137,325
Common equity tier one risk-based capital required to be well capitalized to risk-weighted assets 6.50% 6.50%
Tier one leverage capital $ 287,114 $ 245,158
Tier one leverage capital to average assets 0.0744 0.0754
Tier one leverage capital required for capital adequacy $ 153,414 $ 128,935
Tier one leverage capital required for capital adequacy to risk average assets 0.0400 0.0400
Tier one leverage capital required for capital adequacy, with capital buffer $ 153,414 $ 128,935
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 $ 191,767 $ 161,169
Tier one leverage capitalrequired to be well capitalized to average assets 0.0500 0.0500