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CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($)
Mar. 31, 2020
Dec. 31, 2019
Statement of Financial Position [Abstract]    
Available for sale debt securities amortized cost basis $ 896,435,000 $ 895,273,000
Available for sale debt securities allowance for credit losses $ 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 17,363,455
Common stock, shares outstanding 17,251,532 17,363,455
Treasury stock, shares 111,925 0