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Note 11 - Regulatory Matters - Actual Capital Levels and Minimum Levels (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Consolidated Entities [Member]    
Total capital, amount $ 412,841 $ 396,102
Total capital, ratio 12.60% 12.50%
Total capital minimum required for capital adequacy, amount $ 263,197 $ 253,413
Total capital minimum required for capital adequacy, ratio 8.00% 8.00%
Tier 1 capital, amount $ 388,788 $ 373,721
Tier 1 capital, ratio 11.80% 11.80%
Tier 1 capital minimum required for capital adequacy, amount $ 197,398 $ 190,060
Tier 1 capital minimum required for capital adequacy, ratio 6.00% 6.00%
Common equity tier 1, amount $ 344,323 $ 329,596
Common equity tier 1, ratio 10.50% 10.40%
Common equity tier 1 minimum required for capital adequacy, amount $ 148,049 $ 142,545
Common equity tier 1 capital minimum required for capital adequacy, ratio 4.50% 4.50%
Tier 1 capital to average assets, amount $ 388,788 $ 373,721
Tier 1 capital to average assets, ratio 11.20% 11.40%
Tier 1 capital to average assets, minimum required for capital adequacy, amount $ 139,236 $ 131,014
Tier 1 capital to average assets minimum required for capital adequacy, ratio 4.00% 4.00%
Bank [Member]    
Total capital, amount $ 406,912 $ 388,591
Total capital, ratio 12.40% 12.30%
Total capital minimum required for capital adequacy, amount $ 263,153 $ 253,225
Total capital minimum required for capital adequacy, ratio 8.00% 8.00%
Total capital to be well capitalized, amount $ 328,941 $ 316,531
Total capital to be well capitalized, ratio 10.00% 10.00%
Tier 1 capital, amount $ 382,859 $ 366,211
Tier 1 capital, ratio 11.60% 11.60%
Tier 1 capital minimum required for capital adequacy, amount $ 197,365 $ 189,919
Tier 1 capital minimum required for capital adequacy, ratio 6.00% 6.00%
Tier 1 capital to be well capitalized, amount $ 263,153 $ 253,225
Tier 1 capital to be well capitalized, ratio 8.00% 8.00%
Common equity tier 1, amount $ 382,859 $ 366,211
Common equity tier 1, ratio 11.60% 11.60%
Common equity tier 1 minimum required for capital adequacy, amount $ 148,024 $ 142,439
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 $ 213,812 $ 205,745
Common equity tier 1 capital to be well capitalized, ratio 6.50% 6.50%
Tier 1 capital to average assets, amount $ 382,859 $ 366,211
Tier 1 capital to average assets, ratio 11.00% 11.20%
Tier 1 capital to average assets, minimum required for capital adequacy, amount $ 139,219 $ 130,913
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 $ 174,024 $ 163,641
Tier 1 capital to average assets to be well capitalized, ratio 5.00% 5.00%