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Regulatory Matters - Requirements (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Risk Based Ratios [Abstract] |  |
Common Tier 1 Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets |  | 4.50%
Consolidated Entities [Member] |  |
Capital [Abstract] |  |
Total capital (to risk-weighted assets), Actual, Amount |  | $ 195,371
Total capital (to risk-weighted assets), Minimum required To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount |  | 91,590
Tier One Risk Based Capital [Abstract] |  |
Tier 1 (core) capital (to risk-weighted assets), Actual, Amount |  | 187,005
Tier 1 (core) capital (to risk-weighted assets), Minimum required To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount |  | 68,692
Tier One Leverage Capital [Abstract] |  |
Tier 1 (core) capital (to adjusted average total assets), Minimum required To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount |  | $ 65,085
Risk Based Ratios [Abstract] |  |
Total capital (to risk-weighted assets), Actual, Ratio |  | 17.06%
Total capital (to risk-weighted assets), For Capital Adequacy Purposes, Ratio |  | 8.00%
Tier 1 (core) capital (to risk-weighted assets), Actual, Ratio |  | 16.33%
Tier 1 (core) capital (to risk-weighted assets), Minimum required To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio |  | 6.00%
CET common tier 1 equity |  | $ 187,005
Common Tier 1 to Risk Weighted Assets |  | 16.33%
Common Tier 1 Risk Based Capital Required for Capital Adequacy |  | $ 51,519
Leverage Ratios [Abstract] |  |
Tier 1 (core) capital (to adjusted average total assets), Actual, Ratio |  | 11.49%
Tier 1 (core) capital (to adjusted average total assets), Minimum required To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio |  | 4.00%
BankFinancial NA [Member] |  |
Capital [Abstract] |  |
Total capital (to risk-weighted assets), Actual, Amount | $ 178,664 | $ 188,582
Total capital (to risk-weighted assets), Minimum required To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount | 93,430 | 91,572
Total capital (to risk-weighted assets), Minimum Capital Ratios Established under Capital Plans, Amount | 116,787 | 114,466
Tier One Risk Based Capital [Abstract] |  |
Tier 1 (core) capital (to risk-weighted assets), Actual, Amount | 170,194 | 180,216
Tier 1 (core) capital (to risk-weighted assets), Minimum required To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount | 70,072 | 68,679
Tier 1 (core) capital (to risk-weighted assets), Minimum Capital Ratios Established under Capital Plans, Amount | 93,430 | 91,572
Tier One Leverage Capital [Abstract] |  |
Tier 1 (core) capital (to adjusted average total assets), Actual, Amount | 170,194 | 180,216
Tier 1 (core) capital (to adjusted average total assets), Minimum required To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount | 61,721 | 65,045
Tier 1 (core) capital (to adjusted average total assets), Minimum Capital Ratios Established under Capital Plans, Amount | $ 77,151 | $ 81,307
Risk Based Ratios [Abstract] |  |
Total capital (to risk-weighted assets), Actual, Ratio | 15.30% | 16.48%
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 | 14.57% | 15.74%
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 | $ 170,194 | $ 180,216
Common Tier 1 to Risk Weighted Assets | 14.57% | 15.74%
Common Tier 1 Risk Based Capital Required for Capital Adequacy | $ 52,554 | $ 51,509
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 | $ 75,912 | $ 74,403
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 | 11.03% | 11.08%
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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