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Consolidated Statements of Changes in Stockholders' Equity Consolidated Statements of Changes in Stockholders' Equity (Parentheticals) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Unrealized holding gain on marketable securities-taxes | $ (749) | $ 674 | $ (921)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax | (291) | (716) | 803
Other Comprehensive Income (Loss), Tax | (1,040) | (42) | (118)
Accumulated Other Comprehensive Income (Loss) [Member] |  |  |
Unrealized holding gain on marketable securities-taxes | 749 | (674) | 921
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax | 291 | $ 716 | $ (803)
Other Comprehensive Income (Loss), Tax | $ (1,432) |  |

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