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Note 12 - Regulatory Matters - Regulatory Ratios of the Consolidated Company and Its Subsidiary Banks (Details)
Mar. 31, 2018
Dec. 31, 2017
Common Equity Tier 1 Risk-based Capital [1] 17.07% 16.56%
Tier 1 Risk-based Capital [1] 19.82% 19.30%
Total Risk-based Capital [1] 20.65% 20.12%
Tier 1 Leverage [2] 13.99% 13.75%
Common Equity Tier 1 Risk-based Capital, regulatory minimum [1] 4.50% 4.50%
Tier 1 Risk-based Capital, regulatory minimum [1] 6.00% 6.00%
Total Risk-based Capital , regulatory minimum [1] 8.00% 8.00%
Tier 1 Leverage, regulatory minimum [2] 4.00% 4.00%
Common Equity Tier 1 Risk-based Capital, well-capitalized status [1] 6.50% 6.50%
Tier 1 Risk-based Capital, well-capitalized status [1] 8.00% 8.00%
Total Risk-based Capital , well-capitalized status [1] 10.00% 10.00%
Tier 1 Leverage, well-capitalized status [2] 5.00% 5.00%
United Bank and Capital Trust Company [Member]    
Common Equity Tier 1 Risk-based Capital [1] 14.63% 14.05%
Tier 1 Risk-based Capital [1] 14.63% 14.05%
Total Risk-based Capital [1] 15.47% 14.88%
Tier 1 Leverage [2] 10.47% 10.13%
[1] Common Equity Tier 1 Risked-based, Tier 1 Risk-based, and Total Risk-based Capital ratios are computed by dividing a bank's Common Equity Tier 1, Tier 1 or Total Capital, as defined by regulation, by a risk-weighted sum of the bank's assets, with the risk weighting determined by general standards established by regulation.
[2] Tier 1 Leverage ratio is computed by dividing a bank's Tier 1 Capital by its total quarterly average assets, as defined by regulation.