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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Statement of Financial Position [Abstract]    
Available-for-sale securities, amortized cost $ 325,966 $ 423,980
Common stock, shares authorized 15,000,000 15,000,000
Common stock, shares issued 7,997,247 7,910,804
Common stock, shares outstanding 7,997,247 7,910,804