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Other Non-Interest Income and Expense (Other Non-Interest Income and Expense) (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Other Income and Expenses [Abstract]      
Other $ 47,712 $ 43,563 $ 46,790
Total other non-interest income 47,712 43,563 46,790
Professional services 37,253 39,238 35,941
Advertising, promotions and public relations 34,390 38,001 32,514
Travel/meals and entertainment 7,109 16,459 15,030
Other 87,558 86,967 89,981
Total other non-interest expense $ 166,310 $ 180,665 $ 173,466