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Benefit Plans (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015	Jun. 30, 2014
Life Insurance Benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Benefit plan expense		$ (3)		$ (2)
Accrued interest payable and other liabilities Total		$ 210		213
401 (k) plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Percentage of amount allowable under federal tax regulations		25.00%
Percentage of compensation contributed under federal tax regulations		8.00%
Benefit plan expense		$ 49		52
Salary Continuation Agreement [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Benefit plan expense		10		11
Accrued interest payable and other liabilities Total		218		$ 233
Annual benefit for 20 years		$ 25
Duration of Annual benefit		20 years
Multi-employer pension plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Unfunded liability			$ 53		$ 36
CFBank's contributions			$ 22
Funded status			94.90%		96.52%
Total contributions made to Pentegra DB Plan					$ 163	$ 191
Percentage of amount allowable under federal tax regulations					5.00%	5.00%
Multi-employer pension plan [Member] | Scenario, Forecast [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
CFBank's contributions	$ 42

X

- Definition

Defined Benefit Plan Annual Cost or Change

+ References

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- Definition

Defined Benefit Plan Estimated Annual Benefits Payment Period

+ References

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- Definition

Defined Benefit Plan Unfunded Liability

+ References

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- Definition

Plan assets of a defined benefit plan, as a percentage of projected benefit obligation.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Amount of discretionary contributions made by an employer to a defined contribution plan.

+ References

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- Definition

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

+ References

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- Definition

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

+ References

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- Definition

Amount of contributions made to multiemployer plans by the employer. A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 80
-Section 50
-Paragraph 11
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- Definition

The amount of pension and other (such as medical, dental and life insurance) postretirement benefit costs recognized during the period for (1) defined benefit plans (periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss) on assets, prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments) and for (2) defined contribution plans (to the extent that a plan's defined contributions to an individual's account are to be made for periods in which that individual renders services, the net cost for a period is the contribution called for in that period; if a plan calls for contributions for periods after an individual retires or terminates, the estimated cost is accrued during the employee's service period).

+ References

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- Definition

This represents the entire liability recognized in the balance sheet that is associated with the defined benefit plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-SubTopic 20
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