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Cash and Due from Banks - Additional Information (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Cash And Due From Banks [Line Items]    
Cash and due from banks $ 410,575 $ 391,616
Federal Reserve Bank of Dallas [Member]    
Cash And Due From Banks [Line Items]    
Cash and due from banks $ 115,300 $ 112,400