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Note 12 - Employee Benefit Plan (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Share Based Compensation And Postretirement Benefits, Minimum Age Of Employee (Year)	21 years
Share Based Compensation And Postretirement Benefits, Period of Service Required For Eligibility (Year)	1 year
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	50.00%
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent	6.00%
Defined Contribution Plan, Cost	$ 331,000	$ 323,000

X

- Definition

Represents minimum age if employee for share based compensation and postretirement benefits.

+ References

No definition available.

+ Details

Name:	bfin_ShareBasedCompensationAndPostretirementBenefitsMinimumAgeOfEmployee
Namespace Prefix:	bfin_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents period of service required for eligibility for share based compensation and protirement benefits.

+ References

No definition available.

+ Details

Name:	bfin_ShareBasedCompensationAndPostretirementBenefitsPeriodOfServiceRequiredForEligibility
Namespace Prefix:	bfin_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

+ Details

Name:	us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration