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Regulatory Matters (Tables) | 12 Months Ended
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Dec. 31, 2018
Banking and Thrift [Abstract] |
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations | Actual and required capital amounts and ratios were:
| Actual |  | Required for Capital Adequacy Purposes |  | To be Well-Capitalized under Prompt Corrective Action Provisions
| Amount |  | Ratio |  | Amount |  | Ratio |  | Amount |  | Ratio
December 31, 2018 |  |  |  |  |  |  |  |  |  |  |
Total capital (to risk-weighted assets): |  |  |  |  |  |  |  |  |  |  |
BankFinancial, NA | 178,664 |  |  | 15.30 |  |  | 93,430 |  |  | 8.00 |  |  | $ | 116,787 |  |  | 10.00 | %
Tier 1 (core) capital (to risk-weighted assets): |  |  |  |  |  |  |  |  |  |
BankFinancial, NA | 170,194 |  |  | 14.57 |  |  | 70,072 |  |  | 6.00 |  |  | 93,430 |  |  | 8.00 |
Common Tier 1 (CET1) |  |  |  |  |  |  |  |  |  |  |
BankFinancial, NA | 170,194 |  |  | 14.57 |  |  | 52,554 |  |  | 4.50 |  |  | 75,912 |  |  | 6.50 |
Tier 1 (core) capital (to adjusted average total assets): |  |  |  |  |  |  |  |
BankFinancial, NA | 170,194 |  |  | 11.03 |  |  | 61,721 |  |  | 4.00 |  |  | 77,151 |  |  | 5.00 |
December 31, 2017 |  |  |  |  |  |  |  |  |  |  |
Total capital (to risk-weighted assets): |  |  |  |  |  |  |  |  |  |  |
Consolidated | $ | 195,371 |  |  | 17.06 | % |  | $ | 91,590 |  |  | 8.00 | % |  | N/A |  | N/A
BankFinancial, NA | 188,582 |  |  | 16.48 |  |  | 91,572 |  |  | 8.00 |  |  | $ | 114,466 |  |  | 10.00 | %
Tier 1 (core) capital (to risk-weighted assets): |  |  |  |  |  |  |  |  |  |
Consolidated | 187,005 |  |  | 16.33 |  |  | 68,692 |  |  | 6.00 |  |  | N/A |  | N/A
BankFinancial, NA | 180,216 |  |  | 15.74 |  |  | 68,679 |  |  | 6.00 |  |  | 91,572 |  |  | 8.00 |
Common Tier 1 (CET1) |  |  |  |  |  |  |  |  |  |  |
Consolidated | 187,005 |  |  | 16.33 |  |  | 51,519 |  |  | 4.50 |  |  | N/A |  | N/A
BankFinancial, NA | 180,216 |  |  | 15.74 |  |  | 51,509 |  |  | 4.50 |  |  | 74,403 |  |  | 6.50 |
Tier 1 (core) capital (to adjusted average total assets): |  |  |  |  |  |  |  |
Consolidated | 187,005 |  |  | 11.49 |  |  | 65,085 |  |  | 4.00 |  |  | N/A |  | N/A
BankFinancial, NA | 180,216 |  |  | 11.08 |  |  | 65,045 |  |  | 4.00 |  |  | 81,307 |  |  | 5.00 |

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