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Note 21 - Regulatory Matters - Actual Capital Levels and Minimum Levels (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Consolidated Entities [Member]    
Total capital, amount $ 396,102 $ 379,417
Total capital, ratio 12.50% 12.90%
Total capital minimum required for capital adequacy, amount $ 253,413 $ 235,723
Total capital minimum required for capital adequacy, ratio 8.00% 8.00%
Tier 1 capital, amount $ 373,721 $ 359,915
Tier 1 capital, ratio 11.80% 12.20%
Tier 1 capital minimum required for capital adequacy, amount $ 190,060 $ 176,792
Tier 1 capital minimum required for capital adequacy, ratio 6.00% 6.00%
Common equity tier 1, amount $ 329,596 $ 316,472
Common equity tier 1, ratio 10.40% 10.70%
Common equity tier 1 minimum required for capital adequacy, amount $ 142,545 $ 132,594
Common equity tier 1 capital minimum required for capital adequacy, ratio 4.50% 4.50%
Tier 1 capital to average assets, amount $ 373,721 $ 359,915
Tier 1 capital to average assets, ratio 11.40% 11.30%
Tier 1 capital to average assets, minimum required for capital adequacy, amount $ 131,014 $ 127,782
Tier 1 capital to average assets minimum required for capital adequacy, ratio 4.00% 4.00%
Bank [Member]    
Total capital, amount $ 388,591 $ 371,346
Total capital, ratio 12.30% 12.60%
Total capital minimum required for capital adequacy, amount $ 253,225 $ 235,515
Total capital minimum required for capital adequacy, ratio 8.00% 8.00%
Total capital to be well capitalized, amount $ 316,531 $ 294,393
Total capital to be well capitalized, ratio 10.00% 10.00%
Tier 1 capital, amount $ 366,211 $ 351,844
Tier 1 capital, ratio 11.60% 12.00%
Tier 1 capital minimum required for capital adequacy, amount $ 189,919 $ 176,636
Tier 1 capital minimum required for capital adequacy, ratio 6.00% 6.00%
Tier 1 capital to be well capitalized, amount $ 253,225 $ 235,515
Tier 1 capital to be well capitalized, ratio 8.00% 8.00%
Common equity tier 1, amount $ 366,211 $ 351,844
Common equity tier 1, ratio 11.60% 12.00%
Common equity tier 1 minimum required for capital adequacy, amount $ 142,439 $ 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 $ 205,745 $ 191,356
Common equity tier 1 capital to be well capitalized, ratio 6.50% 6.50%
Tier 1 capital to average assets, amount $ 366,211 $ 351,844
Tier 1 capital to average assets, ratio 11.20% 11.00%
Tier 1 capital to average assets, minimum required for capital adequacy, amount $ 130,913 $ 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 $ 163,641 $ 159,623
Tier 1 capital to average assets to be well capitalized, ratio 5.00% 5.00%