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Note 12 - Regulatory Matters - Actual Capital Levels and Minimum Levels (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Consolidated Entities [Member]    
Total capital, amount $ 404,521 $ 379,417
Total capital, ratio 13.10% 12.90%
Total capital minimum required for capital adequacy, amount $ 248,013 $ 235,723
Total capital minimum required for capital adequacy, ratio 8.00% 8.00%
Tier 1 capital, amount $ 382,829 $ 359,915
Tier 1 capital, ratio 12.40% 12.20%
Tier 1 capital minimum required for capital adequacy, amount $ 186,010 $ 176,792
Tier 1 capital minimum required for capital adequacy, ratio 6.00% 6.00%
Common equity tier 1, amount $ 338,874 $ 316,472
Common equity tier 1, ratio 10.90% 10.70%
Common equity tier 1 minimum required for capital adequacy, amount $ 139,508 $ 132,594
Common equity tier 1 capital minimum required for capital adequacy, ratio 4.50% 4.50%
Tier 1 capital to average assets, amount $ 382,829 $ 359,915
Tier 1 capital to average assets, ratio 11.80% 11.30%
Tier 1 capital to average assets, minimum required for capital adequacy, amount $ 130,188 $ 127,782
Tier 1 capital to average assets minimum required for capital adequacy, ratio 4.00% 4.00%
Bank [Member]    
Total capital, amount $ 396,382 $ 371,346
Total capital, ratio 12.80% 12.60%
Total capital minimum required for capital adequacy, amount $ 247,819 $ 235,515
Total capital minimum required for capital adequacy, ratio 8.00% 8.00%
Total capital to be well capitalized, amount $ 309,774 $ 294,393
Total capital to be well capitalized, ratio 10.00% 10.00%
Tier 1 capital, amount $ 374,690 $ 351,844
Tier 1 capital, ratio 12.10% 12.00%
Tier 1 capital minimum required for capital adequacy, amount $ 185,865 $ 176,636
Tier 1 capital minimum required for capital adequacy, ratio 6.00% 6.00%
Tier 1 capital to be well capitalized, amount $ 247,819 $ 235,515
Tier 1 capital to be well capitalized, ratio 8.00% 8.00%
Common equity tier 1, amount $ 374,690 $ 351,844
Common equity tier 1, ratio 12.10% 12.00%
Common equity tier 1 minimum required for capital adequacy, amount $ 139,399 $ 132,477
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 $ 201,353 $ 191,356
Common equity tier 1 capital to be well capitalized, ratio 6.50% 6.50%
Tier 1 capital to average assets, amount $ 374,690 $ 351,844
Tier 1 capital to average assets, ratio 11.50% 11.00%
Tier 1 capital to average assets, minimum required for capital adequacy, amount $ 130,125 $ 127,698
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 $ 162,656 $ 159,623
Tier 1 capital to average assets to be well capitalized, ratio 5.00% 5.00%