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Regulatory Matters (Tables)

12 Months Ended

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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- References

No definition available.

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X

- Definition

Tabular disclosure of the capital amounts and ratios as of the balance sheet date, indicating whether the entity or entities are in compliance with regulatory capital requirements, by entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1G
-URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958577-112826

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1H
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=84167132&loc=d3e65071-112826

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958568-112826

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958570-112826

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