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Restrictions on Cash and Due from Banks (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]    
Cash and due from banks $ 139,557 $ 92,508
Cash Reserves Required by Banking Regulations [Member]    
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]    
Cash and due from banks $ 39,500 $ 36,700