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Note 19 - Regulatory Matters - Risk Based Capital Amounts and Ratios (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Total risk-based capital    
Total risk-based capital, actual amount [1] $ 405,845 $ 396,019
Total risk-based capital, actual ratio [1] 14.04% 13.91%
Total risk-based capital, minimum for adequately capitalized amount [1] $ 231,221 $ 227,714
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 $ 379,031 $ 370,135
Common Equity Tier 1 risk-based capital, actual ratio 13.11% 13.00%
Common Equity Tier 1 risk-based capital, minimum for adequately capitalized amount $ 130,062 $ 128,089
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] $ 379,031 $ 370,135
Tier 1 risk-based capital, actual ratio [1] 13.11% 13.00%
Tier 1 risk-based capital, minimum for adequately capitalized amount [1] $ 173,416 $ 170,785
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] $ 379,031 $ 370,135
Leverage, actual ratio [3] 11.57% 11.33%
Leverage, minimum for adequately capitalized amount [3] $ 130,989 $ 130,698
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] $ 396,707 $ 385,637
Total risk-based capital, actual ratio [1] 13.74% 13.56%
Total risk-based capital, minimum for adequately capitalized amount [1] $ 230,901 $ 227,462
Total risk-based capital, minimum for adequately capitalized ratio [1] 8.00% 8.00%
Total risk-based capital, minimum for well capitalized amount [1] $ 288,626 $ 284,327
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 $ 369,893 $ 359,753
Common Equity Tier 1 risk-based capital, actual ratio 12.82% 12.65%
Common Equity Tier 1 risk-based capital, minimum for adequately capitalized amount $ 129,882 $ 127,947
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 $ 187,607 $ 184,813
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] $ 369,893 $ 359,753
Tier 1 risk-based capital, actual ratio [1] 12.82% 12.65%
Tier 1 risk-based capital, minimum for adequately capitalized amount [1] $ 173,176 $ 170,596
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] $ 230,901 $ 227,462
Tier 1 risk-based capital, minimum for well capitalized ratio [1] 8.00% 8.00%
Leverage    
Leverage, actual amount [3] $ 369,893 $ 359,753
Leverage, actual ratio [3] 11.31% 11.02%
Leverage, minimum for adequately capitalized amount [3] $ 130,837 $ 130,569
Leverage, minimum for adequately capitalized ratio [3] 4.00% 4.00%
Leverage, minimum for well capitalized amount [3] $ 163,546 $ 163,211
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.