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Note 12 - Regulatory Matters - Actual Capital Levels and Minimum Levels (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Consolidated Entities [Member]    
Tier 1 capital minimum required for capital adequacy, ratio 6.00% 6.00%
Common equity tier 1, amount $ 304,651 $ 293,555
Common equity tier 1, ratio 10.70% 10.90%
Common equity tier 1 minimum required for capital adequacy, amount $ 128,773 $ 121,398
Common equity tier 1 capital minimum required for capital adequacy, ratio 4.50% 4.50%
Tier 1 capital, amount $ 347,754 $ 336,316
Tier 1 capital to average assets, ratio 11.50% 11.20%
Tier 1 capital minimum required for capital adequacy, amount $ 121,114 $ 120,486
Tier 1 capital to average assets minimum required for capital adequacy, ratio 4.00% 4.00%
Total capital, amount $ 366,048 $ 354,278
Total capital, ratio 12.80% 13.10%
Total capital minimum required for capital adequacy, amount $ 228,929 $ 215,819
Total capital minimum required for capital adequacy, ratio 8.00% 8.00%
Tier 1 capital, amount $ 347,754 $ 336,316
Tier 1 capital, ratio 12.20% 12.50%
Tier 1 capital minimum required for capital adequacy, amount $ 171,697 $ 161,864
Bank [Member]    
Tier 1 capital minimum required for capital adequacy, ratio 6.00% 6.00%
Tier 1 capital to be well capitalized, amount $ 228,713 $ 215,605
Tier 1 capital to be well capitalized, ratio 8.00% 8.00%
Common equity tier 1, amount $ 343,346 $ 335,282
Common equity tier 1, ratio 12.00% 12.40%
Common equity tier 1 minimum required for capital adequacy, amount $ 128,651 $ 121,278
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 $ 185,829 $ 175,179
Common equity tier 1 capital to be well capitalized, ratio 6.50% 6.50%
Tier 1 capital, amount $ 343,346 $ 335,282
Tier 1 capital to average assets, ratio 11.30% 11.10%
Tier 1 capital minimum required for capital adequacy, amount $ 121,093 $ 120,383
Tier 1 capital to average assets minimum required for capital adequacy, ratio 4.00% 4.00%
Tier 1 capital to be well capitalized, amount $ 151,366 $ 150,479
Tier 1 capital to average assets to be well capitalized, ratio 5.00% 5.00%
Total capital, amount $ 361,641 $ 353,243
Total capital, ratio 12.70% 13.10%
Total capital minimum required for capital adequacy, amount $ 228,713 $ 215,605
Total capital minimum required for capital adequacy, ratio 8.00% 8.00%
Total capital to be well capitalized, amount $ 285,891 $ 269,506
Total capital to be well capitalized, ratio 10.00% 10.00%
Tier 1 capital, amount $ 343,346 $ 335,282
Tier 1 capital, ratio 12.00% 12.40%
Tier 1 capital minimum required for capital adequacy, amount $ 171,535 $ 161,704