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CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Statement of Financial Position [Abstract]    
Available for sale debt securities, amortized cost $ 1,051,661 $ 881,570
Available for sale debt securities, allowance for credit losses $ 0 $ 0
Common stock, par value $ 0.0625 $ 0.0625
Common stock, shares authorized 60,000,000 60,000,000
Common stock, shares issued 17,363,457 17,363,457
Common stock, shares outstanding 17,320,446 17,265,337
Treasury stock, shares 43,011 98,120