Other Non-Interest Income and Expense (Other Non-Interest Income and Expense) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Other Income and Expenses [Abstract]
Other	$ 43,563	$ 46,790	$ 37,222
Total other non-interest income	43,563	46,790	37,222
Professional services	39,238	35,941	27,968
Advertising, promotions and public relations	38,001	32,514	29,337
Travel/meals and entertainment	16,459	15,030	15,066
Check card expense	5,947	4,744	16,501
Other	81,020	85,309	86,417
Total other non-interest expense	$ 180,665	$ 173,538	$ 175,289