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Interim Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
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