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Accumulated Other Comprehensive Loss (Schedule of Reclassifications From Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Tax (expense) benefit | $ (648) | $ (793) |  |
Net income | 2,506 | 1,980 | $ 2,506 | $ 5,269
Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net income | (261) | (248) |  |
Investment securities- with OTTI [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Interest income (expense) on investment securities: taxable | 55 | 2 |  |
Tax (expense) benefit | (15) | 0 |  |
Net income | 40 | 2 |  |
Investment Securities -All Other AFS [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net gains/(losses) - other | (9) | (9) |  |
Tax (expense) benefit | 2 | 4 |  |
Net income | (7) | (5) |  |
Investment Securities HTM [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Interest income (expense) on investment securities: taxable | (76) | (101) |  |
Tax (expense) benefit | 31 | 40 |  |
Net income | (45) | (61) |  |
Pension Plan [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Tax (expense) benefit | 82 | 105 |  |
Net income | (220) | (162) |  |
Pension Plan [Member] | Amortization of unrecognized loss [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Salaries and employee benefits | (300) | (264) |  |
Pension Plan [Member] | Amortization of transition asset [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Salaries and employee benefits | 0 | 0 |  |
Pension Plan [Member] | Amortization of prior service costs [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Salaries and employee benefits | (2) | (3) |  |
SERP [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Tax (expense) benefit | 11 | 14 |  |
Net income | (29) | (22) |  |
SERP [Member] | Amortization of unrecognized loss [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Salaries and employee benefits | (41) | (37) |  |
SERP [Member] | Amortization of prior service costs [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Salaries and employee benefits | $ 1 | $ 1 |  |

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