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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Statement Of Financial Position [Abstract]            
Securities - Held to maturity, Fair value $ 8,094   $ 7,527      
Allowance for loan and lease losses $ 27,256 $ 24,547 $ 18,748 $ 20,367 $ 19,797 $ 15,405