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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Other Income and Expenses [Abstract]      
Other $ 46,790 $ 37,222 $ 41,144
Total other non-interest income 46,790 37,222 41,144
Professional services 35,941 27,968 26,664
Advertising, promotions and public relations 32,514 29,337 27,677
Travel/meals and entertainment 15,030 15,066 14,393
Check card expense 4,744 16,501 19,442
Other 85,309 86,417 90,812
Total other non-interest expense $ 173,538 $ 175,289 $ 178,988