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Note 19 - Regulatory Matters - Risk Based Capital Amounts and Ratios (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Total risk-based capital      
Total risk-based capital, actual amount [1] $ 351,241   $ 338,525
Total risk-based capital, actual ratio [1] 13.49%   13.04%
Total risk-based capital, minimum for adequately capitalized amount [1] $ 208,297   $ 207,684
Total risk-based capital, minimum for adequately capitalized ratio [1] 8.00%   8.00%
Total risk-based capital, minimum for well capitalized amount [1],[2]  
Total risk-based capital, minimum for well capitalized ratio [1],[2]  
Common equity tier 1 risk-based capital      
Common Equity Tier 1 risk-based capital, actual amount $ 325,753   $ 314,147
Common Equity Tier 1 risk-based capital, actual ratio 12.51%   12.10%
Common Equity Tier 1 risk-based capital, minimum for adequately capitalized amount $ 117,177   $ 116,832
Common Equity Tier 1 risk-based capital, minimum for adequately capitalized ratio 4.50%   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      
Leverage, minimum for well capitalized ratio [2],[3]  
Tier 1 risk-based capital, actual amount [1]   $ 325,753 $ 314,147
Tier 1 risk-based capital, actual ratio [1] 12.51%   12.10%
Tier 1 risk-based capital, minimum for adequately capitalized amount [1] $ 156,236   $ 155,775
Tier 1 risk-based capital, minimum for adequately capitalized ratio [1] 6.00%   6.00%
Tier 1 risk-based capital, minimum for well capitalized amount [1],[2]  
Tier 1 risk-based capital, minimum for well capitalized ratio [1],[2]  
Leverage      
Leverage, actual amount [3] $ 325,753   $ 314,147
Leverage, actual ratio [3] 10.88%   10.54%
Leverage, minimum for adequately capitalized amount [3] $ 119,762   $ 119,221
Leverage, minimum for adequately capitalized ratio [3] 4.00%   4.00%
Leverage, minimum for well capitalized amount [2],[3]  
Subsidiaries [Member]      
Total risk-based capital      
Total risk-based capital, actual amount [1] $ 338,984   $ 325,630
Total risk-based capital, actual ratio [1] 13.06%   12.57%
Total risk-based capital, minimum for adequately capitalized amount [1] $ 207,647   $ 207,243
Total risk-based capital, minimum for adequately capitalized ratio [1] 8.00%   8.00%
Total risk-based capital, minimum for well capitalized amount [1] $ 259,559   $ 259,053
Total risk-based capital, minimum for well capitalized ratio [1] 10.00%   10.00%
Common equity tier 1 risk-based capital      
Common Equity Tier 1 risk-based capital, actual amount $ 313,496   $ 301,252
Common Equity Tier 1 risk-based capital, actual ratio 12.08%   11.63%
Common Equity Tier 1 risk-based capital, minimum for adequately capitalized amount $ 116,782   $ 116,564
Common Equity Tier 1 risk-based capital, minimum for adequately capitalized ratio 4.50%   4.50%
Common Equity Tier 1 risk-based capital, minimum for well capitalized amount $ 155,710   $ 155,418
Common Equity Tier 1 risk-based capital, minimum for well capitalized ratio 6.00%   6.00%
Tier 1 risk-based capital      
Leverage, minimum for well capitalized ratio [3] 5.00%   5.00%
Tier 1 risk-based capital, actual amount [1] $ 313,496   $ 301,252
Tier 1 risk-based capital, actual ratio [1] 12.08%   11.63%
Tier 1 risk-based capital, minimum for adequately capitalized amount [1] $ 155,710   $ 155,418
Tier 1 risk-based capital, minimum for adequately capitalized ratio [1] 6.00%   6.00%
Tier 1 risk-based capital, minimum for well capitalized amount [1] $ 155,710   $ 155,418
Tier 1 risk-based capital, minimum for well capitalized ratio [1] 6.00%   6.00%
Leverage      
Leverage, actual amount [3] $ 313,496   $ 301,252
Leverage, actual ratio [3] 10.48%   10.11%
Leverage, minimum for adequately capitalized amount [3] $ 119,655   $ 119,190
Leverage, minimum for adequately capitalized ratio [3] 4.00%   4.00%
Leverage, minimum for well capitalized amount [3] $ 149,569   $ 148,987
[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 is computed in relation to average assets.