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Note 21 - Regulatory Matters (Details Textual)		Sep. 30, 2025	Dec. 31, 2024	Mar. 07, 2022
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.

X

- Definition

The percent of unconsolidated trust subsidiaries acquired under business combination.

+ References

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- Definition

Represents capital required for capital adequacy to risk weighted assets including capital conservation buffer.

+ References

No definition available.

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- Definition

The Common Equity Tier 1 capital ratio required to be categorized as "well capitalized" under the regulatory framework for prompt corrective action.

+ References

No definition available.

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- Definition

Represents tier one risk based capital required for capital adequacy to risk weighted assets including capital conservation buffer.

+ References

No definition available.

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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

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- Definition

Ratio of minimum Common Equity Tier 1 risk-based capital to risk-weighted assets categorized as well capitalized as defined by regulatory framework for prompt corrective action.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 505
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-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477270/942-505-50-1

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- Definition

Percentage of voting equity interest acquired in business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 805
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8
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-URI https://asc.fasb.org/1943274/2147479328/805-10-50-8

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Ratio of minimum total risk-based capital to risk-weighted assets categorized as well capitalized as defined by regulatory framework for prompt corrective action.

+ References

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-Topic 942
-SubTopic 505
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-Section 50
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-Subparagraph (c)(1)
-Publisher FASB
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Ratio of minimum Tier 1 leverage capital to average assets categorized as well capitalized as defined by regulatory framework for prompt corrective action.

+ References

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- Definition

Ratio of minimum Tier 1 risk-based capital to risk-weighted assets categorized as well capitalized as defined by regulatory framework for prompt corrective action.

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