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Note 18 - Regulatory Matters - Risk Based Capital Amounts and Ratios (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Total risk-based capital    
Total risk-based capital, actual amount [1] $ 376,209 $ 359,866
Total risk-based capital, actual ratio [1] 13.06% 13.52%
Total risk-based capital, minimum for adequately capitalized amount [1] $ 230,450 $ 213,012
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 $ 350,986 $ 334,631
Common Equity Tier 1 risk-based capital, actual ratio 12.18% 12.57%
Common Equity Tier 1 risk-based capital, minimum for adequately capitalized amount $ 129,675 $ 119,820
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    
Tier 1 risk-based capital, actual amount [1] $ 350,986 $ 334,631
Tier 1 risk-based capital, actual ratio [1] 12.18% 12.57%
Tier 1 risk-based capital, minimum for adequately capitalized amount [1] $ 172,900 $ 159,760
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] $ 350,986 $ 334,631
Leverage, actual ratio [3] 11.19% 10.70%
Leverage, minimum for adequately capitalized amount [3] $ 125,464 $ 125,122
Leverage, minimum for adequately capitalized ratio [3] 4.00% 4.00%
Leverage, minimum for well capitalized amount [2],[3]
Leverage, minimum for well capitalized ratio [2],[3]
Subsidiaries [Member]    
Total risk-based capital    
Total risk-based capital, actual amount [1] $ 365,470 $ 347,840
Total risk-based capital, actual ratio [1] 12.70% 13.07%
Total risk-based capital, minimum for adequately capitalized amount [1] $ 230,217 $ 212,891
Total risk-based capital, minimum for adequately capitalized ratio [1] 8.00% 8.00%
Total risk-based capital, minimum for well capitalized amount [1] $ 287,772 $ 266,114
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 $ 340,247 $ 322,605
Common Equity Tier 1 risk-based capital, actual ratio 11.82% 12.12%
Common Equity Tier 1 risk-based capital, minimum for adequately capitalized amount $ 129,536 $ 212,891
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 $ 187,107 $ 172,974
Common Equity Tier 1 risk-based capital, minimum for well capitalized ratio 6.50% 6.50%
Tier 1 risk-based capital    
Tier 1 risk-based capital, actual amount [1] $ 340,247 $ 322,605
Tier 1 risk-based capital, actual ratio [1] 11.82% 12.12%
Tier 1 risk-based capital, minimum for adequately capitalized amount [1] $ 172,714 $ 159,668
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] $ 230,286 $ 212,891
Tier 1 risk-based capital, minimum for well capitalized ratio [1] 8.00% 8.00%
Leverage    
Leverage, actual amount [3] $ 340,247 $ 322,605
Leverage, actual ratio [3] 10.85% 10.32%
Leverage, minimum for adequately capitalized amount [3] $ 125,437 $ 125,040
Leverage, minimum for adequately capitalized ratio [3] 4.00% 4.00%
Leverage, minimum for well capitalized amount [3] $ 156,796 $ 156,300
Leverage, minimum for well capitalized ratio [3] 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 is computed in relation to average assets.