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Benefit Plans (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Jun. 30, 2017 | Dec. 31, 2016 | Jun. 30, 2016 | Jun. 30, 2015
Life Insurance Benefits [Member] |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Benefit plan expense | $ (19) |  | $ (3) |  |
Accrued interest payable and other liabilities Total | $ 191 |  | 210 |  |
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 | $ 57 |  | 49 |  |
Salary Continuation Agreement [Member] |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Benefit plan expense | 10 |  | 10 |  |
Accrued interest payable and other liabilities Total | 203 |  | $ 218 |  |
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 |  | $ 36 |  | $ 53 |
CFBank's contributions |  | $ 32 |  | 42 |
Funded status |  | 96.54% |  |  | 94.90%
Total contributions made to Pentegra DB Plan |  |  |  | $ 153,186 | $ 163,138
Percentage of amount allowable under federal tax regulations |  |  |  | 5.00% | 5.00%

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