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Benefit Plans (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Jun. 30, 2016 | Jul. 01, 2018 | Jul. 01, 2017
Life Insurance Benefits [Member] |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |
Benefit plan expense | $ (9) |  | $ (19) |  |  |  |
Accrued interest payable and other liabilities Total | $ 182 |  | 191 |  |  |  |
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 | 50.00% |  |  |  |  |  |
Percentage of compensation contributed under federal tax regulations | 6.00% |  |  |  |  |  |
Benefit plan expense | $ 106 |  | 57 |  |  |  |
Salary Continuation Agreement [Member] |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |
Benefit plan expense | 9 |  | 10 |  |  |  |
Accrued interest payable and other liabilities Total | 187 |  | $ 203 |  |  |  |
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 |  | $ 61 |  | $ 36 |  |  |
CFBank's contributions |  | $ 18 |  | 32 |  |  |
Funded status |  |  |  |  |  | 94.33% | 96.54%
Total contributions made to Pentegra DB Plan |  |  |  | $ 367,119 | $ 153,186 |  |
Percentage of amount allowable under federal tax regulations |  |  |  | 5.00% | 5.00% |  |

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