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Investment Securities (Tables) | 6 Months Ended
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Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract] |
Investment Securities [Table Text Block] | The following table summarizes the amortized cost and fair value of securities available-for-sale and securities held-to-maturity at December 31, 2016 and June 30, 2016, the corresponding amounts of gross unrealized gains recognized in accumulated other comprehensive income and gross unrecognized gains and losses:
|  | December 31, 2016 |
(in thousands) |  | Amortized cost |  | Gross unrealized/ unrecognized gains |  | Gross unrealized/ unrecognized losses |  | Estimated fair value |
Available-for-sale Securities |  |  |  |  |  |  |  |  |  |  |  |  |
Agency mortgage-backed: residential |  | $ | 78 |  | $ | 1 |  | $ | — |  | $ | 79 |
FHLMC stock |  |  | 8 |  |  | 99 |  |  | — |  |  | 107 |
|  | $ | 86 |  | $ | 100 |  | $ | — |  | $ | 186 |
Held-to-maturity Securities |  |  |  |  |  |  |  |  |  |  |  |  |
Agency mortgage-backed: residential |  | $ | 1,768 |  | $ | 54 |  | $ | 9 |  | $ | 1,813 |
U.S. Treasury notes |  |  | 6,500 |  |  | — |  |  | — |  |  | 6,500 |
Agency bonds |  |  | 1,007 |  |  | — |  |  | — |  |  | 1,007 |
|  | $ | 9,275 |  | $ | 54 |  | $ | 9 |  | $ | 9,320 |
|  |  |  |  | June 30, 2016 |  |  |  |
(in thousands) |  | Amortized cost |  | Gross unrealized/ unrecognized gains |  | Gross unrealized/ unrecognized losses |  | Estimated fair value |
Available-for-sale Securities |  |  |  |  |  |  |  |  |  |  |  |  |
Agency mortgage-backed: residential |  | $ | 79 |  | $ | 2 |  | $ | — |  | $ | 81 |
FHLMC stock |  |  | 8 |  |  | 45 |  |  | — |  |  | 53 |
|  | $ | 87 |  | $ | 47 |  | $ | — |  | $ | 134 |
Held-to-maturity Securities |  |  |  |  |  |  |  |  |  |  |  |  |
Agency mortgage-backed: residential |  | $ | 2,048 |  | $ | 70 |  | $ | 2 |  | $ | 2,118 |
Agency bonds |  |  | 2,031 |  |  | 2 |  |  | 1 |  |  | 2,033 |
|  | $ | 4,079 |  | $ | 72 |  | $ | 3 |  | $ | 4,151 |
Held-to-maturity Securities [Table Text Block] | The amortized cost and fair value of held-to-maturity debt securities are shown by contractual maturity. Securities not due at a single maturity date are shown separately.
|  | December 31, 2016 |
(in thousands) |  | Amortized Cost |  | Fair Value |
Held-to-maturity Securities |  |  |  |  |  |  |
Within one year |  | $ | 7,000 |  | $ | 7,000 |
One to five years |  |  | 507 |  |  | 507 |
Mortgage-backed |  |  | 1,768 |  |  | 1,813 |
|  | $ | 9,275 |  | $ | 9,320 |

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