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Restrictions on Cash and Due from Banks (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]    
Cash and due from banks $ 404,355 $ 131,555
Cash Reserves Required by Banking Regulations    
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]    
Cash and due from banks $ 114,300 $ 77,000