Note 12 - Regulatory Matters - Actual Capital Levels and Minimum Levels (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Consolidated Entities [Member]
Total capital, amount	$ 354,580	$ 345,539
Total capital, ratio	13.10%	13.50%
Total capital minimum required for capital adequacy, amount	$ 217,441	$ 205,602
Total capital minimum required for capital adequacy, ratio	8.00%	8.00%
Tier 1 capital, amount	$ 337,054	$ 329,858
Tier 1 capital, ratio	12.40%	12.80%
Tier 1 capital minimum required for capital adequacy, amount	$ 163,081	$ 154,201
Tier 1 capital minimum required for capital adequacy, ratio	6.00%	6.00%
Common equity tier 1, amount	$ 294,463	$ 280,171
Common equity tier 1, ratio	10.80%	10.90%
Common equity tier 1 minimum required for capital adequacy, amount	$ 122,311	$ 115,804
Common equity tier 1 capital minimum required for capital adequacy, ratio	4.50%	4.50%
Tier 1 capital, amount	$ 337,054	$ 329,858
Tier 1 capital to average assets, ratio	11.30%	11.60%
Tier 1 capital minimum required for capital adequacy, amount	$ 119,485	$ 114,138
Tier 1 capital to average assets minimum required for capital adequacy, ratio	4.00%	4.00%
Bank [Member]
Total capital, amount	$ 355,706	$ 347,433
Total capital, ratio	13.10%	13.50%
Total capital minimum required for capital adequacy, amount	$ 217,213	$ 205,624
Total capital minimum required for capital adequacy, ratio	8.00%	8.00%
Total capital to be well capitalized, amount	$ 271,516	$ 257,030
Total capital to be well capitalized, ratio	10.00%	10.00%
Tier 1 capital, amount	$ 338,180	$ 331,752
Tier 1 capital, ratio	12.50%	12.90%
Tier 1 capital minimum required for capital adequacy, amount	$ 162,910	$ 154,218
Tier 1 capital minimum required for capital adequacy, ratio	6.00%	6.00%
Tier 1 capital to be well capitalized, amount	$ 217,213	$ 205,624
Tier 1 capital to be well capitalized, ratio	8.00%	8.00%
Common equity tier 1, amount	$ 338,180	$ 331,752
Common equity tier 1, ratio	12.50%	12.90%
Common equity tier 1 minimum required for capital adequacy, amount	$ 122,182	$ 115,664
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	$ 176,485	$ 167,070
Common equity tier 1 capital to be well capitalized, ratio	6.50%	6.50%
Tier 1 capital, amount	$ 338,180	$ 331,752
Tier 1 capital to average assets, ratio	11.30%	11.60%
Tier 1 capital minimum required for capital adequacy, amount	$ 119,440	$ 114,280
Tier 1 capital to average assets minimum required for capital adequacy, ratio	4.00%	4.00%
Tier 1 capital to be well capitalized, amount	$ 149,300	$ 142,850
Tier 1 capital to average assets to be well capitalized, ratio	5.00%	5.00%