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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Statement of Financial Position [Abstract]    
Available-for-sale securities, amortized cost $ 501,245 $ 547,912
Common stock, shares authorized 15,000,000 15,000,000
Common stock, shares issued 7,870,969 7,857,293
Common stock, shares outstanding 7,870,969 7,857,293