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Note 23 - Regulatory Matters - Risk Based Capital Amounts and Ratios (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Total risk-based capital    
Total risk-based capital, actual amount $ 359,866 $ 338,525
Total risk-based capital, actual ratio 13.52% 13.04%
Total risk-based capital, minimum for adequately capitalized amount $ 213,012 $ 207,684
Total risk-based capital, minimum for adequately capitalized ratio 8.00% 8.00%
Total risk-based capital, minimum for well capitalized amount [1]
Total risk-based capital, minimum for well capitalized ratio [1]
Common Equity Tier 1 risk-based capital    
Common Equity Tier 1 risk-based capital, actual amount [2] $ 334,631 $ 314,147
Common Equity Tier 1 risk-based capital, actual ratio [2] 12.57% 12.10%
Common Equity Tier 1 risk-based capital, minimum for adequately capitalized amount [2] $ 119,820 $ 116,832
Common Equity Tier 1 risk-based capital, minimum for adequately capitalized ratio [2] 4.50% 4.50%
Common Equity Tier 1 risk-based capital, minimum for well capitalized amount [1],[2]
Common Equity Tier 1 risk-based capital, minimum for well capitalized ratio [1],[2]
Tier 1 risk-based capital    
Tier 1 risk-based capital, actual amount $ 334,631 $ 314,147
Tier 1 risk-based capital, actual ratio 12.57% 12.10%
Tier 1 risk-based capital, minimum for adequately capitalized amount $ 159,760 $ 155,775
Tier 1 risk-based capital, minimum for adequately capitalized ratio 6.00% 6.00%
Tier 1 risk-based capital, minimum for well capitalized amount [1]
Tier 1 risk-based capital, minimum for well capitalized ratio [1]
Leverage    
Leverage, actual amount $ 334,631 $ 314,147
Leverage, actual ratio 10.70% 10.54%
Leverage, minimum for adequately capitalized amount $ 125,122 $ 119,221
Leverage, minimum for adequately capitalized ratio 4.00% 4.00%
Leverage, minimum for well capitalized amount [1]  
Leverage, minimum for well capitalized ratio [1]  
Subsidiaries [Member]    
Total risk-based capital    
Total risk-based capital, actual amount $ 347,840 $ 325,630
Total risk-based capital, actual ratio 13.07% 12.57%
Total risk-based capital, minimum for adequately capitalized amount $ 212,891 $ 207,243
Total risk-based capital, minimum for adequately capitalized ratio 8.00% 8.00%
Total risk-based capital, minimum for well capitalized amount $ 266,114 $ 258,986
Total risk-based capital, minimum for well capitalized ratio 10.00% 10.00%
Common Equity Tier 1 risk-based capital    
Common Equity Tier 1 risk-based capital, actual amount [2] $ 322,605 $ 301,252
Common Equity Tier 1 risk-based capital, actual ratio [2] 12.12% 11.63%
Common Equity Tier 1 risk-based capital, minimum for adequately capitalized amount [2] $ 212,891 $ 116,564
Common Equity Tier 1 risk-based capital, minimum for adequately capitalized ratio [2] 4.50% 4.50%
Common Equity Tier 1 risk-based capital, minimum for well capitalized amount [2] $ 172,974 $ 168,341
Common Equity Tier 1 risk-based capital, minimum for well capitalized ratio [2] 6.50% 6.50%
Tier 1 risk-based capital    
Tier 1 risk-based capital, actual amount $ 322,605 $ 301,252
Tier 1 risk-based capital, actual ratio 12.12% 11.63%
Tier 1 risk-based capital, minimum for adequately capitalized amount $ 159,668 $ 155,418
Tier 1 risk-based capital, minimum for adequately capitalized ratio 6.00% 6.00%
Tier 1 risk-based capital, minimum for well capitalized amount $ 212,891 $ 207,189
Tier 1 risk-based capital, minimum for well capitalized ratio 8.00% 8.00%
Leverage    
Leverage, actual amount $ 322,605 $ 301,252
Leverage, actual ratio 10.32% 10.11%
Leverage, minimum for adequately capitalized amount $ 125,040 $ 119,190
Leverage, minimum for adequately capitalized ratio 4.00% 4.00%
Leverage, minimum for well capitalized amount $ 156,300 $ 148,927
Leverage, minimum for well capitalized ratio 5.00% 5.00%
[1] Not applicable. Regulatory framework does not define well capitalized for holding companies.
[2] Ratio is computed in relation to average assets.