Note 21 - Regulatory Matters (Details Textual) $ in Thousands		Jun. 30, 2022 USD ($)		Mar. 07, 2022	Dec. 31, 2021 USD ($)	Jan. 01, 2019	Jan. 01, 2016
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		6.00%
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%
Capital Conservation Buffer						2.50%	0.625%
Subordinated Debt, Ending Balance		$ 26,144			$ 0
Commonwealth [Member]
Business Acquisition, Percentage of Voting Interests Acquired				100.00%
Subordinated Debt, Ending Balance		$ 26,000
Commonwealth Statutory Trust III [Member] | Commonwealth [Member]
Business Acquisition, Percentage of Voting Interests Acquired				100.00%
Commonwealth Statutory Trust IV [Member] | Commonwealth [Member]
Business Combination, Unconsolidated Trust Subsidiaries Acquired, Percent				100.00%
Commonwealth Statutory Trust V [Member] | Commonwealth [Member]
Business Combination, Unconsolidated Trust Subsidiaries Acquired, Percent				100.00%
Subsidiaries [Member]
Banking Regulation, Common Equity Tier One Risk-Based Capital Ratio, Well Capitalized, Minimum		0.065	[1]		0.0650
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets	[1]	0.080			0.0800
Banking Regulation, Total Risk-Based Capital Ratio, Well Capitalized, Minimum	[1]	0.100			0.1000
Tier One Leverage Capital Required to be Well Capitalized to Average Assets	[2]	0.050			0.0500

[1] Ratio is computed in relation to risk-weighted assets.

[2] Ratio is computed in relation to average assets.