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Note 21 - Regulatory Requirements and Restrictions - Company's and Bank's Capital Ratios (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Common equity Tier 1 ratio, actual amount $ 251,052 $ 241,671
Common equity Tier 1, actual ratio 13.98% 13.88%
Common equity Tier 1 ratio, required amount $ 80,816 $ 78,362
Common equity Tier 1, required ratio 4.50% 4.50%
Tier 1 risk-based capital ratio, actual amount $ 251,052 $ 256,671
Tier 1 risk-based capital, actual ratio 13.98% 14.74%
Tier 1 risk-based capital ratio, required amount $ 107,754 $ 104,483
Tier 1 risk-based capital, required ratio 6.00% 6.00%
Total risk-based capital ratio, actual amount $ 270,394 $ 274,953
Total risk-based capital, actual ratio 15.06% 15.79%
Total risk-based capital ratio, required amount $ 143,672 $ 139,311
Total risk-based capital, required ratio 8.00% 8.00%
Tier 1 Leverage ratio, actual amount $ 251,052 $ 256,671
Tier 1 Leverage, actual ratio 11.06% 11.07%
Tier 1 Leverage ratio, required amount $ 90,822 $ 92,742
Tier 1 Leverage, required ratio 4.00% 4.00%
First Community Bank [Member]    
Common equity Tier 1 ratio, actual amount $ 222,856 $ 223,944
Common equity Tier 1, actual ratio 12.47% 12.93%
Common equity Tier 1 ratio, required amount $ 80,447 $ 77,956
Common equity Tier 1, required ratio 4.50% 4.50%
Tier 1 risk-based capital ratio, actual amount $ 222,856 $ 223,944
Tier 1 risk-based capital, actual ratio 12.47% 12.93%
Tier 1 risk-based capital ratio, required amount $ 107,262 $ 103,941
Tier 1 risk-based capital, required ratio 6.00% 6.00%
Total risk-based capital ratio, actual amount $ 242,218 $ 242,218
Total risk-based capital, actual ratio 13.55% 13.98%
Total risk-based capital ratio, required amount $ 143,016 $ 138,588
Total risk-based capital, required ratio 8.00% 8.00%
Tier 1 Leverage ratio, actual amount $ 222,856 $ 223,944
Tier 1 Leverage, actual ratio 9.84% 9.71%
Tier 1 Leverage ratio, required amount $ 90,604 $ 92,274
Tier 1 Leverage, required ratio 4.00% 4.00%
Common equity Tier 1 to be well capitalized, amount [1] $ 116,201 $ 112,603
Common equity Tier 1, to be well capitalized ratio [1] 6.50% 6.50%
Tier 1 risk-based capital to be well capitalized, amount [1] $ 178,771 $ 138,588
Tier 1 risk-based capital, to be well capitalized ratio [1] 8.00% 8.00%
Total risk-based capital to be well capitalized, amount [1] $ 143,016 $ 173,235
Total risk-based capital, to be well capitalized ratio [1] 10.00% 10.00%
Tier 1 Leverage to be well capitalized, amount [1] $ 113,255 $ 115,343
Tier 1 Leverage, to be well capitalized ratio [1] 5.00% 5.00%
Fully Phased-In [Member]    
Common equity Tier 1 ratio, required amount $ 125,713 $ 121,897
Common equity Tier 1, required ratio 7.00% 7.00%
Tier 1 risk-based capital, actual ratio 8.50% 8.50%
Tier 1 risk-based capital ratio, required amount $ 152,652 $ 148,018
Total risk-based capital ratio, required amount $ 188,570 $ 182,846
Total risk-based capital, required ratio 10.50% 10.50%
Tier 1 Leverage ratio, required amount $ 90,822 $ 92,742
Tier 1 Leverage, required ratio 4.00% 4.00%
Fully Phased-In [Member] | First Community Bank [Member]    
Common equity Tier 1 ratio, required amount $ 125,139 $ 121,264
Common equity Tier 1, required ratio 7.00% 7.00%
Tier 1 risk-based capital, actual ratio 8.50% 8.50%
Tier 1 risk-based capital ratio, required amount $ 151,955 $ 147,249
Total risk-based capital ratio, required amount $ 187,709 $ 181,897
Total risk-based capital, required ratio 10.50% 10.50%
Tier 1 Leverage ratio, required amount $ 90,604 $ 92,274
Tier 1 Leverage, required ratio 4.00% 4.00%
[1] Based on prompt corrective action provisions