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Income Taxes (Tables) | 6 Months Ended
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Jun. 30, 2018
Income Tax Contingency [Line Items] |
Income Tax Rate Reconciliation |
Income Tax Rate Reconciliation
| Three Months Ended June 30, | Six Months Ended June 30,
| 2018 | 2017 | 2018 | 2017
Tax provision at U.S. federal statutory rate [1] | $ | 112 |  | $ | (99 | ) | $ | 221 |  | $ | 41 |
Tax-exempt interest | (17 | ) | (30 | ) | (34 | ) | (60 | )
Executive compensation | 3 |  | — |  | 7 |  | — |
Stock-based compensation | — |  | (1 | ) | (2 | ) | (8 | )
Other | 5 |  | 1 |  | 2 |  | (4 | )
Provision for income taxes | $ | 103 |  | $ | (129 | ) | $ | 194 |  | $ | (31 | )
[1]Due to the passage of Tax Reform on December 22, 2017, current and prior period federal statutory rates are reflected at 21% and 35% respectively.
Roll-forward of Unrecognized Tax Benefits |
Rollforward of Unrecognized Tax Benefits
| Three Months Ended June 30, | Six Months Ended June 30,
| 2018 | 2017 | 2018 | 2017
Balance, beginning of period | $ | 9 |  | $ | 12 |  | $ | 9 |  | $ | 12 |
Gross increases - tax positions in prior period | — |  | — |  | — |  | — |
Gross decreases - tax positions in prior period | — |  | — |  | — |  | — |
Balance, end of period | $ | 9 |  | $ | 12 |  | $ | 9 |  | $ | 12 |
Future Tax Benefits |
Future Tax Benefits
| As of |
| June 30, 2018 | Expiration
| Carryover amount | Expected tax benefit, gross | Dates | Amount
Net operating loss carryover - U.S. | $ | 3,219 |  | $ | 676 |  | 2023 | - | 2036 | $ | 3,219 |
Net operating loss carryover - foreign | $ | 4 |  | $ | — |  | No expiration | $ | 4 |
Foreign tax credit carryover | $ | 14 |  | $ | 14 |  | 2023 | - | 2024 | $ | 14 |
General business credit carryover | $ | 4 |  | $ | 4 |  | 2031 | - | 2037 | $ | 4 |

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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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- Definition Tabular disclosure for tax positions taken in the tax returns filed or to be filed for which it is more likely than not that the tax position will not be sustained upon examination by taxing authorities and other income tax contingencies. Includes, but is not limited to, interest and penalties, reconciliation of unrecognized tax benefits, unrecognized tax benefits that would affect the effective tax rate, tax years that remain subject to examination by tax jurisdictions, and information about positions for which it is reasonably possible that amounts unrecognized will significantly change within 12 months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32840-109319 + Details
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- Definition Tabular disclosure of pertinent information, such as tax authority, amounts, and expiration dates, of net operating loss carryforwards, including an assessment of the likelihood of utilization. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 + Details
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