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Interim Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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Statement of Financial Position [Abstract] |  |
Available-for-sale securities, amortized cost | $ 555,001 |
Common stock, shares authorized | 15,000,000 | 15,000,000
Common stock, shares issued | 7,894,341 | 7,857,293
Common stock, shares outstanding | 7,894,341 | 7,857,293
Common stock, shares held in Rabbi Trust | 27,705 | 31,769

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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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