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Note 12 - Regulatory Matters - Actual Capital Levels and Minimum Levels (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Consolidated Entities [Member]    
Total capital, amount $ 402,469 $ 396,102
Total capital, ratio 12.60% 12.50%
Total capital minimum required for capital adequacy, amount $ 256,344 $ 253,413
Total capital minimum required for capital adequacy, ratio 8.00% 8.00%
Tier 1 capital, amount $ 379,334 $ 373,721
Tier 1 capital, ratio 11.80% 11.80%
Tier 1 capital minimum required for capital adequacy, amount $ 192,258 $ 190,060
Tier 1 capital minimum required for capital adequacy, ratio 6.00% 6.00%
Common equity tier 1, amount $ 335,038 $ 329,596
Common equity tier 1, ratio 10.50% 10.40%
Common equity tier 1 minimum required for capital adequacy, amount $ 144,194 $ 142,545
Common equity tier 1 capital minimum required for capital adequacy, ratio 4.50% 4.50%
Tier 1 capital to average assets, amount $ 379,334 $ 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 $ 135,908 $ 131,014
Tier 1 capital to average assets minimum required for capital adequacy, ratio 4.00% 4.00%
Bank [Member]    
Total capital, amount $ 397,741 $ 388,591
Total capital, ratio 12.40% 12.30%
Total capital minimum required for capital adequacy, amount $ 256,311 $ 253,225
Total capital minimum required for capital adequacy, ratio 8.00% 8.00%
Total capital to be well capitalized, amount $ 320,389 $ 316,531
Total capital to be well capitalized, ratio 10.00% 10.00%
Tier 1 capital, amount $ 374,606 $ 366,211
Tier 1 capital, ratio 11.70% 11.60%
Tier 1 capital minimum required for capital adequacy, amount $ 192,233 $ 189,919
Tier 1 capital minimum required for capital adequacy, ratio 6.00% 6.00%
Tier 1 capital to be well capitalized, amount $ 256,311 $ 253,225
Tier 1 capital to be well capitalized, ratio 8.00% 8.00%
Common equity tier 1, amount $ 374,606 $ 366,211
Common equity tier 1, ratio 11.70% 11.60%
Common equity tier 1 minimum required for capital adequacy, amount $ 144,175 $ 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 $ 208,253 $ 205,745
Common equity tier 1 capital to be well capitalized, ratio 6.50% 6.50%
Tier 1 capital to average assets, amount $ 374,606 $ 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 $ 135,868 $ 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 $ 169,835 $ 163,641
Tier 1 capital to average assets to be well capitalized, ratio 5.00% 5.00%