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Note 21 - Regulatory Matters (Details Textual) | Sep. 30, 2025 | Dec. 31, 2024 | Mar. 07, 2022
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Banking Regulation, Capital Conservation Buffer, Capital Conserved, Minimum |  | 0.025 |  |
Common Equity Tier One Risk Based Capital, Required to Be Well Capitalized to Risk Weighted Assets Including Capital Conservation Buffer |  | 7.00% |  |
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets Including Capital Conservation Buffer |  | 8.50% |  |
Capital Required for Capital Adequacy to Risk Weighted Assets Including Capital Conservation Buffer |  | 10.50% |  |
Commonwealth [Member] |  |  |  |
Business Combination, Voting Equity Interest Acquired, Percentage |  |  |  | 100.00%
Commonwealth [Member] | Commonwealth Statutory Trust III [Member] |  |  |  |
Business Combination, Voting Equity Interest Acquired, Percentage |  |  |  | 100.00%
Commonwealth [Member] | Commonwealth Statutory Trust IV [Member] |  |  |  |
Business Combination, Unconsolidated Trust Subsidiaries Acquired, Percent |  |  |  | 100.00%
Commonwealth [Member] | Commonwealth Statutory Trust V [Member] |  |  |  |
Business Combination, Unconsolidated Trust Subsidiaries Acquired, Percent |  |  |  | 100.00%
Subsidiaries [Member] |  |  |  |
Banking Regulation, Common Equity Tier 1 Risk-Based Capital Ratio, Well Capitalized, Minimum | [1] | 0.065 | 0.065 |
Banking Regulation, Tier 1 Risk-Based Capital Ratio, Well Capitalized, Minimum | [1] | 0.08 | 0.08 |
Banking Regulation, Total Risk-Based Capital Ratio, Well Capitalized, Minimum | [1] | 0.10 | 0.10 |
Banking Regulation, Tier 1 Leverage Capital Ratio, Well Capitalized, Minimum |  | 0.05 | 0.05 |
[1] | Ratio is computed in relation to risk-weighted assets.

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- Definition Minimum capital conservation buffer percentage required to avoid restriction on payout amount of eligible retained income as defined by regulatory framework. + 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 + Details
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