Note 23 - Regulatory Matters (Details) - Risk Based Capital Amounts and Ratios - USD ($) $ in Thousands		Dec. 31, 2015	Dec. 31, 2014
Total risk-based capital (1)
Total risk-based capital, actual amount	[1]	$ 307,666	$ 280,228
Total risk-based capital, actual ratio	[1]	13.31%	13.86%
Total risk-based capital, minimum for adequately capitalized amount	[1]	$ 184,923	$ 161,748
Total risk-based capital, minimum for adequately capitalized ratio	[1]	8.00%	8.00%
Total risk-based capital, minimum for well capitalized amount	[2]
Total risk-based capital, minimum for well capitalized ratio	[2]
Common Equity Tier 1 risk-based capital (2)
Common equity tier 1 risk-based capital, actual amount	[3]	$ 284,793
Common equity tier 1 risk-based capital, actual ratio	[3]	12.32%
Common equity tier 1 risk-based capital, minimum for adequately capitalized amount	[3]	$ 104,023
Common equity tier 1 risk-based capital, minimum for adequately capitalized ratio	[3]	4.50%
Common equity tier 1 risk-based capital, minimum for well capitalized amount	[2]
Common equity tier 1 risk-based capital, minimum for well capitalized ratio	[2]
Tier 1 risk-based capital (1)
Tier 1 risk-based capital, actual amount	[1]	$ 284,793	$ 255,308
Tier 1 risk-based capital, actual ratio	[1]	12.32%	12.63%
Tier 1 risk-based capital, minimum for adequately capitalized amount	[1]	$ 138,698	$ 80,858
Tier 1 risk-based capital, minimum for adequately capitalized ratio	[1]	6.00%	4.00%
Tier 1 risk-based capital, minimum for well capitalized amount	[2]
Tier 1 risk-based capital, minimum for well capitalized ratio	[2]
Leverage (3)
Leverage, actual amount	[4]	$ 284,793	$ 255,308
Leverage, actual ratio	[4]	10.53%	10.26%
Leverage, minimum for adequately capitalized amount	[4]	$ 108,183	$ 74,651
Leverage, minimum for adequately capitalized ratio	[4]	4.00%	3.00%
Leverage, minimum for well capitalized amount	[2]
Leverage, minimum for well capitalized ratio	[2]
Subsidiaries [Member]
Total risk-based capital (1)
Total risk-based capital, actual amount	[1]	$ 298,129	$ 274,345
Total risk-based capital, actual ratio	[1]	12.91%	13.59%
Total risk-based capital, minimum for adequately capitalized amount	[1]	$ 184,743	$ 161,498
Total risk-based capital, minimum for adequately capitalized ratio	[1]	8.00%	8.00%
Total risk-based capital, minimum for well capitalized amount	[1]	$ 230,929	$ 201,873
Total risk-based capital, minimum for well capitalized ratio	[1]	10.00%	10.00%
Common Equity Tier 1 risk-based capital (2)
Common equity tier 1 risk-based capital, actual amount	[3]	$ 275,256
Common equity tier 1 risk-based capital, actual ratio	[3]	11.92%
Common equity tier 1 risk-based capital, minimum for adequately capitalized amount	[3]	$ 103,914
Common equity tier 1 risk-based capital, minimum for adequately capitalized ratio	[3]	4.50%
Common equity tier 1 risk-based capital, minimum for well capitalized amount	[3]	$ 138,552
Common equity tier 1 risk-based capital, minimum for well capitalized ratio	[3]	6.00%
Tier 1 risk-based capital (1)
Tier 1 risk-based capital, actual amount	[1]	$ 275,256	$ 249,425
Tier 1 risk-based capital, actual ratio	[1]	11.92%	12.36%
Tier 1 risk-based capital, minimum for adequately capitalized amount	[1]	$ 138,552	$ 80,720
Tier 1 risk-based capital, minimum for adequately capitalized ratio	[1]	6.00%	4.00%
Tier 1 risk-based capital, minimum for well capitalized amount	[1]	$ 138,552	$ 121,080
Tier 1 risk-based capital, minimum for well capitalized ratio	[1]	6.00%	6.00%
Leverage (3)
Leverage, actual amount	[4]	$ 275,256	$ 249,425
Leverage, actual ratio	[4]	10.19%	10.04%
Leverage, minimum for adequately capitalized amount	[4]	$ 108,049	$ 74,529
Leverage, minimum for adequately capitalized ratio	[4]	4.00%	3.00%
Leverage, minimum for well capitalized amount	[4]	$ 135,062	$ 124,216
Leverage, minimum for well capitalized ratio	[4]	5.00%	5.00%

[1] Ratio is computed in relation to risk-weighted assets.

[2] Not applicable. Regulatory framework does not define well capitalized for holding companies.

[3] Ratio became effective January 2015.

[4] Ratio is computed in relation to average assets.