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Note 11 - Regulatory Matters - Actual Capital Levels and Minimum Levels (Details)
$ in Thousands
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
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 $ 431,273 $ 429,038
Total capital, ratio 0.13 0.131
Total capital minimum required for capital adequacy, amount $ 264,747 $ 262,141
Total capital minimum required for capital adequacy, ratio 0.08 0.08
Tier 1 capital, amount $ 406,445 $ 405,148
Tier 1 capital, ratio 0.123 0.124
Tier 1 capital minimum required for capital adequacy, amount $ 198,561 $ 196,606
Tier 1 capital minimum required for capital adequacy, ratio 0.06 0.06
Common equity tier 1, amount $ 361,468 $ 360,342
Common equity tier 1, ratio 0.109 0.11
Common equity tier 1 minimum required for capital adequacy, amount $ 148,921 $ 147,454
Common equity tier 1 capital minimum required for capital adequacy, ratio 0.045 0.045
Tier 1 capital to average assets, amount $ 406,445 $ 405,148
Tier 1 capital to average assets, ratio 0.115 0.113
Tier 1 capital to average assets, minimum required for capital adequacy, amount $ 141,732 $ 143,689
Tier 1 capital to average assets minimum required for capital adequacy, ratio 0.04 0.04
Bank [Member]    
Total capital, amount $ 425,372 $ 424,917
Total capital, ratio 0.129 0.13
Total capital minimum required for capital adequacy, amount $ 264,699 $ 262,088
Total capital minimum required for capital adequacy, ratio 0.08 0.08
Total capital to be well capitalized, amount $ 330,873 $ 327,610
Total capital to be well capitalized, ratio 0.1 0.1
Tier 1 capital, amount $ 400,544 $ 401,027
Tier 1 capital, ratio 0.121 0.122
Tier 1 capital minimum required for capital adequacy, amount $ 198,524 $ 196,566
Tier 1 capital minimum required for capital adequacy, ratio 0.06 0.06
Tier 1 capital to be well capitalized, amount $ 264,699 $ 262,088
Tier 1 capital to be well capitalized, ratio 0.08 0.08
Common equity tier 1, amount $ 400,544 $ 401,027
Common equity tier 1, ratio 0.121 0.122
Common equity tier 1 minimum required for capital adequacy, amount $ 148,893 $ 147,425
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 $ 215,068 $ 212,947
Common equity tier 1 capital to be well capitalized, ratio 0.065 0.065
Tier 1 capital to average assets, amount $ 400,544 $ 401,027
Tier 1 capital to average assets, ratio 0.113 0.112
Tier 1 capital to average assets, minimum required for capital adequacy, amount $ 141,708 $ 143,670
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 $ 177,135 $ 179,588
Tier 1 capital to average assets to be well capitalized, ratio 0.05 0.05