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Note 17 - Regulatory Capital | 12 Months Ended
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Dec. 31, 2024
Notes to Financial Statements |
Regulatory Capital Requirements under Banking Regulations [Text Block] |
17. | REGULATORY CAPITAL
Financial institution regulators have established guidelines for minimum capital ratios for banks and bank holding companies. The net unrealized gain or loss on available for sale securities is generally not included in computing regulatory capital. To avoid limitations on capital distributions, including dividend payments, the Bank and the Company must each hold a capital conservation buffer above the adequately capitalized risk-based capital ratios. Within the tabular presentation that follows is the adequately capitalized ratio plus a 2.50% capital conservation buffer. The Bank and the Company met each of the well-capitalized ratio guidelines as of December 31, 2024 and 2023. The following table indicates the capital ratios for the Bank and the Company as of December 31, 2024, and 2023, as well as the capital category threshold ratios for a well-capitalized, adequately capitalized plus the capital conservation buffer institution.
|  | As of December 31, 2024 |
|  | Leverage |  |  | Tier 1 Risk Based |  |  | Common Equity Tier 1 |  |  | Total Risk Based |
The Middlefield Banking Company |  |  | 10.70 | % |  |  | 11.99 | % |  |  | 11.99 | % |  |  | 13.24 | %
Middlefield Banc Corp. |  |  | 10.86 | % |  |  | 12.28 | % |  |  | 11.78 | % |  |  | 13.54 | %
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, 2023 |
|  | Leverage |  |  | Tier 1 Risk Based |  |  | Common Equity Tier 1 |  |  | Total Risk Based |
The Middlefield Banking Company |  |  | 10.48 | % |  |  | 11.82 | % |  |  | 11.82 | % |  |  | 13.08 | %
Middlefield Banc Corp. |  |  | 10.68 | % |  |  | 12.18 | % |  |  | 11.66 | % |  |  | 13.43 | %
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 -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477270/942-505-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477270/942-505-50-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477270/942-505-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477270/942-505-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477270/942-505-50-1 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1D -Publisher FASB -URI https://asc.fasb.org/1943274/2147477270/942-505-50-1D Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1A -Publisher FASB -URI https://asc.fasb.org/1943274/2147477270/942-505-50-1A Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1F -Publisher FASB -URI https://asc.fasb.org/1943274/2147477270/942-505-50-1F + Details
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