Regulatory Capital Matters (Actual And Required Capital Amounts And Ratios Of CFBank) (Details) $ in Thousands	Jun. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)
Regulatory Capital Matters [Abstract]
Total Capital to risk weighted assets, Actual Amount	$ 159,701	$ 136,683
Tier 1 (Core) Capital to risk weighted assets, Actual Amount	145,522	124,678
Common equity tier 1 capital to risk-weighted assets, Actual Amount	145,522	124,678
Tier 1 (Core) Capital to adjusted total assets (Leverage ratio), Actual Amount	$ 145,522	$ 124,678
Total Capital to risk weighted assets, Actual Ratio	0.1410	0.1431
Tier 1 (Core) Capital to risk weighted assets, Actual Ratio	0.1285	0.1305
Common equity tier 1 capital to risk-weighted assets, Actual Ratio	0.1285	0.1305
Tier 1 (Core) Capital to adjusted total assets, Actual Ratio	0.0972	0.0974
Total Capital to risk weighted assets, Minimum Capital Required-Basel III Fully Phased-In Amount	$ 118,944	$ 100,298
Tier 1 (Core) Capital to risk weighted assets, Minimum Capital Required-Basel III Fully Phased-In Amount	96,288	81,194
Common equity tier 1 capital to risk-weighted assets, Minimum Capital Required-Basel III Fully Phased-In Amount	79,296	66,866
Tier 1 (Core) Capital to adjusted total assets, Minimum Capital Required-Basel III Fully Phased-In Amount	$ 59,915	$ 51,187
Total Capital to risk weighted assets, Minimum Capital Required-Basel III Fully Phased-In Ratio	0.1050	0.1050
Tier 1 (Core) Capital to risk weighted assets, Minimum Capital Required-Basel III Fully Phased-In Ratio	0.0850	0.0850
Common equity tier 1 capital to risk-weighted assets, Minimum Capital Required-Basel III Fully Phased-In Ratio	0.0700	0.0700
Tier 1 (Core) Capital to adjusted total assets, Minimum Capital Required-Basel III Fully Phased-In Ratio	0.0400	0.0400
Total Capital to risk weighted assets, To Be Well Capitalized Under Applicable Regulatory Capital Standards Amount	$ 113,280	$ 95,522
Tier 1 (Core) Capital to risk weighted assets, To Be Well Capitalized Under Applicable Regulatory Capital Standards Amount	90,624	76,418
Common equity tier 1 capital to risk-weighted assets, To Be Well Capitalized Under Applicable Regulatory Capital Standards Amount	73,632	62,089
Tier 1 (Core) Capital to adjusted total assets, To Be Well Capitalized Under Applicable Regulatory Capital Standards Amount	$ 74,894	$ 63,984
Total Capital to risk weighted assets, To Be Well Capitalized Under Applicable Regulatory Capital Standards Ratio	0.1000	0.1000
Tier 1 (Core) Capital to risk weighted assets, To Be Well Capitalized Under Applicable Regulatory Capital Standards Ratio	0.0800	0.0800
Common equity tier 1 capital to risk-weighted assets, To Be Well Capitalized Under Applicable Regulatory Capital Standards Ratio	0.0650	0.0650
Tier 1 (Core) Capital to adjusted total assets, To Be Well Capitalized Under Applicable Regulatory Capital Standards Ratio	0.0500	0.0500