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Note 12 - Regulatory Matters - Actual Capital Levels and Minimum Levels (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Consolidated Entities [Member]    
Total capital, amount $ 387,520 $ 379,417
Total capital, ratio 13.20% 12.90%
Total capital minimum required for capital adequacy, amount $ 234,830 $ 235,723
Total capital minimum required for capital adequacy, ratio 8.00% 8.00%
Tier 1 capital, amount $ 367,546 $ 359,915
Tier 1 capital, ratio 12.50% 12.20%
Tier 1 capital minimum required for capital adequacy, amount $ 176,123 $ 176,792
Tier 1 capital minimum required for capital adequacy, ratio 6.00% 6.00%
Common equity tier 1, amount $ 323,932 $ 316,472
Common equity tier 1, ratio 11.00% 10.70%
Common equity tier 1 minimum required for capital adequacy, amount $ 132,092 $ 132,594
Common equity tier 1 capital minimum required for capital adequacy, ratio 4.50% 4.50%
Tier 1 capital to average assets, amount $ 367,546 $ 359,915
Tier 1 capital to average assets, ratio 11.50% 11.30%
Tier 1 capital to average assets, minimum required for capital adequacy, amount $ 127,794 $ 127,782
Tier 1 capital to average assets minimum required for capital adequacy, ratio 4.00% 4.00%
Bank [Member]    
Total capital, amount $ 379,370 $ 371,346
Total capital, ratio 12.90% 12.60%
Total capital minimum required for capital adequacy, amount $ 234,646 $ 235,515
Total capital minimum required for capital adequacy, ratio 8.00% 8.00%
Total capital to be well capitalized, amount $ 293,307 $ 294,393
Total capital to be well capitalized, ratio 10.00% 10.00%
Tier 1 capital, amount $ 359,396 $ 351,844
Tier 1 capital, ratio 12.30% 12.00%
Tier 1 capital minimum required for capital adequacy, amount $ 175,984 $ 176,636
Tier 1 capital minimum required for capital adequacy, ratio 6.00% 6.00%
Tier 1 capital to be well capitalized, amount $ 234,646 $ 235,515
Tier 1 capital to be well capitalized, ratio 8.00% 8.00%
Common equity tier 1, amount $ 359,396 $ 351,844
Common equity tier 1, ratio 12.30% 12.00%
Common equity tier 1 minimum required for capital adequacy, amount $ 131,988 $ 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 $ 190,650 $ 191,356
Common equity tier 1 capital to be well capitalized, ratio 6.50% 6.50%
Tier 1 capital to average assets, amount $ 359,396 $ 351,844
Tier 1 capital to average assets, ratio 11.30% 11.00%
Tier 1 capital to average assets, minimum required for capital adequacy, amount $ 127,712 $ 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 $ 159,640 $ 159,623
Tier 1 capital to average assets to be well capitalized, ratio 5.00% 5.00%