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Regulatory Matters - Requirements (Details) - BankFinancial NA [Member] - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Capital [Abstract] |  |
Total capital (to risk-weighted assets), Actual, Amount | $ 170,203 | $ 178,664
Total capital (to risk-weighted assets), Minimum required To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount | 83,130 | 93,430
Total capital (to risk-weighted assets), Minimum Capital Ratios Established under Capital Plans, Amount | 103,913 | 116,787
Tier One Risk Based Capital [Abstract] |  |
Tier 1 (core) capital (to risk-weighted assets), Actual, Amount | 162,455 | 170,194
Tier 1 (core) capital (to risk-weighted assets), Minimum required To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount | 62,348 | 70,072
Tier 1 (core) capital (to risk-weighted assets), Minimum Capital Ratios Established under Capital Plans, Amount | 83,130 | 93,430
Tier One Leverage Capital [Abstract] |  |
Tier 1 (core) capital (to adjusted average total assets), Actual, Amount | 162,455 | 170,194
Tier 1 (core) capital (to adjusted average total assets), Minimum required To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount | 59,666 | 61,721
Tier 1 (core) capital (to adjusted average total assets), Minimum Capital Ratios Established under Capital Plans, Amount | $ 74,583 | $ 77,151
Risk Based Ratios [Abstract] |  |
Total capital (to risk-weighted assets), Actual, Ratio | 16.38% | 15.30%
Total capital (to risk-weighted assets), For Capital Adequacy Purposes, Ratio | 8.00% | 8.00%
Total capital (to risk-weighted assets), Minimum Capital Ratios Established under Capital Plans, Ratio | 10.00% | 10.00%
Tier 1 (core) capital (to risk-weighted assets), Actual, Ratio | 15.63% | 14.57%
Tier 1 (core) capital (to risk-weighted assets), Minimum required To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio | 6.00% | 6.00%
Tier 1 (core) capital (to risk-weighted assets), Minimum Capital Ratios Established under Capital Plans, Ratio | 8.00% | 8.00%
CET common tier 1 equity | $ 162,455 | $ 170,194
Common Tier 1 to Risk Weighted Assets | 15.63% | 14.57%
Common Tier 1 Risk Based Capital Required for Capital Adequacy | $ 46,761 | $ 52,554
Common Tier 1 Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets | 4.50% | 4.50%
Common Tier One Capital required to be well capitalized | $ 67,543 | $ 75,912
Common Tier One Risk Weighted Assets Required to be Well Capitalized to Risk Weighted Assets | 6.50% | 6.50%
Leverage Ratios [Abstract] |  |
Tier 1 (core) capital (to adjusted average total assets), Actual, Ratio | 10.89% | 11.03%
Tier 1 (core) capital (to adjusted average total assets), Minimum required To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio | 4.00% | 4.00%
Tier 1 (core) capital (to adjusted average total assets), Minimum Capital Ratios Established under Capital Plans, Ratio | 5.00% | 5.00%

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