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Note 17 - Regulatory Capital (Tables) | 12 Months Ended
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Dec. 31, 2024
Notes Tables |
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block] |
|  | 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 Tabular disclosure of the capital amounts and ratios as of the balance sheet date, indicating whether the entity or entities are in compliance with regulatory capital requirements, by entity. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(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 1B -Publisher FASB -URI https://asc.fasb.org/1943274/2147477270/942-505-50-1B + Details
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