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Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Dec. 31, 2017
Equity [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] | The following table provides the components of other comprehensive income (loss) on a pretax and after-tax basis for the periods presented (in thousands):
|  | Years Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
|  | Pre-tax |  |  | Tax |  |  | After-tax |  |  | Pre-tax |  |  | Tax |  |  | After-tax |  |  | Pre-tax |  |  | Tax |  |  | After-tax |
Net unrealized gains (losses) on investments available for sale arising during the period |  | $ | 2,773 |  |  |  | 1,058 |  |  | $ | 1,715 |  |  | $ | (1,594 | ) |  |  | (609 | ) |  | $ | (985 | ) |  | $ | (2,480 | ) |  | $ | (963 | ) |  | $ | (1,517 | )
Less: Amounts reclassified from accumulated other comprehensive income (loss) |  |  | (2,570 | ) |  |  | (982 | ) |  |  | (1,588 | ) |  |  | (2,294 | ) |  |  | (877 | ) |  |  | (1,417 | ) |  |  | (1,060 | ) |  |  | (406 | ) |  |  | (654 | )
Net current period other comprehensive income (loss) |  | $ | 203 |  |  | $ | 76 |  |  | $ | 127 |  |  | $ | (3,888 | ) |  | $ | (1,486 | ) |  | $ | (2,402 | ) |  | $ | (3,540 | ) |  | $ | (1,369 | ) |  | $ | (2,171 | )
Reclassifications Out of Accumulated Other Comprehensive Income | The following table provides the reclassifications out of accumulated other comprehensive income for the periods presented (in thousands):
|  | Amounts Reclassified from |  |
|  | Accumulated Other |  |
|  | Comprehensive Income |  |
Details about Accumulated Other |  | Years Ended December 31, |  | Affected Line Item in the Statement
Comprehensive Income Components |  | 2017 |  |  | 2016 |  |  | 2015 |  | Where Net Income is Presented
Unrealized gains (losses) on investments available for sale |  |  |  |  |  |  |  |  |  |  |  |  |
|  | $ | 2,570 |  |  | $ | 2,294 |  |  | $ | 1,060 |  | Net realized gains (losses) on investments
|  |  | (982 | ) |  |  | (877 | ) |  |  | (406 | ) | Income taxes, current
|  | $ | 1,588 |  |  | $ | 1,417 |  |  | $ | 654 |  | Net of tax

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- Definition Tabular disclosure of information about items reclassified out of accumulated other comprehensive income (loss). + References No definition available. + Details
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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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