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Note 17 - Regulatory Capital | 12 Months Ended
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Dec. 31, 2020
Notes to Financial Statements |
Regulatory Capital Requirements under Banking Regulations [Text Block] |
17. | REGULATORY CAPITAL
The Bank and Company are subject to regulatory capital requirements administered by banking agencies. Capital adequacy guidelines and prompt corrective action regulations involve quantitative measures of assets, liabilities, and certain off-balance-sheet items calculated under regulatory accounting practices. Capital amounts and classifications are also subject to qualitative judgments by regulators about components, risk weightings, and other factors and the regulators can lower classifications in certain cases. Failure to meet various capital requirements can initiate regulatory action that could have a direct material effect on the financial statements. As of December 31, 2020, the Bank and Company have met all capital adequacy requirements to which they are subject. The prompt corrective action regulations provide five classifications, including well capitalized, adequately capitalized, under-capitalized, significantly undercapitalized, and critically undercapitalized, although these terms are not used to represent overall financial condition. If an institution is adequately capitalized, regulatory approval is required before the institution may accept brokered deposits. If an institution is undercapitalized, capital distributions are limited, as is asset growth and expansion, and plans for capital restoration are required. The capital conservation buffer is designed to absorb losses during periods of economic stress. Banking institutions with a ratio of Common Equity Tier 1 capital to risk-weighted assets above the minimum but below the conservation buffer (or below the combined capital conservation buffer and countercyclical capital buffer, when the latter is applied) will face constraints on dividends, equity repurchases and compensation based on the amount of the shortfall. The following tables present actual and required capital ratios as of December 31, 2020 and 2019, under the Basel III Capital Rules. Capital levels required to be considered well capitalized are based upon prompt corrective action regulations, as amended to reflect the changes under the Basel III Capital Rules.
|  | As of December 31, 2020 |
|  | Leverage |  |  | Tier 1 Risk Based |  |  | Common Equity Tier 1 |  |  | Total Risk Based |
The Middlefield Banking Company |  |  | 9.45 | % |  |  | 11.47 | % |  |  | 11.47 | % |  |  | 12.68 | %
Middlefield Banc Corp. |  |  | 10.22 | % |  |  | 11.68 | % |  |  | 10.96 | % |  |  | 12.88 | %
Adequately capitalized ratio |  |  | 4.00 | % |  |  | 6.00 | % |  |  | 4.50 | % |  |  | 8.00 | %
Adequately capitalized ratio plus fully phased-in capital conservation buffer |  |  | 4.00 | % |  |  | 8.50 | % |  |  | 7.00 | % |  |  | 10.50 | %
Well-capitalized ratio (Bank only) |  |  | 5.00 | % |  |  | 8.00 | % |  |  | 6.50 | % |  |  | 10.00 | %
|  | As of December 31, 2019 |
|  | Leverage |  |  | Tier 1 Risk Based |  |  | Common Equity Tier 1 |  |  | Total Risk Based |
The Middlefield Banking Company |  |  | 10.35 | % |  |  | 12.12 | % |  |  | 12.12 | % |  |  | 12.79 | %
Middlefield Banc Corp. |  |  | 10.23 | % |  |  | 12.56 | % |  |  | 11.77 | % |  |  | 13.23 | %
Adequately capitalized ratio |  |  | 4.00 | % |  |  | 6.00 | % |  |  | 4.50 | % |  |  | 8.00 | %
Adequately capitalized ratio plus fully phased-in capital conservation buffer |  |  | 4.00 | % |  |  | 8.50 | % |  |  | 7.00 | % |  |  | 10.50 | %
Well-capitalized ratio (Bank only) |  |  | 5.00 | % |  |  | 8.00 | % |  |  | 6.50 | % |  |  | 10.00 | %

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- Definition The entire disclosure for regulatory capital requirement for depository and lending institutions. Institutions include, but not are not limited to, finance company, insured depository institution, bank holding company, savings and loan association holding company, bank and savings institution not federally insured, mortgage company, foreign financial institution and credit union. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1F -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958575-112826 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958569-112826 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1D -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958573-112826 + Details
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