Other Non-Interest Income and Expense (Other Non-Interest Income and Expense) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Other Income and Expenses [Abstract]
Other	$ 41,144	$ 35,656	$ 32,256
Total other non-interest income	41,144	35,656	32,256
Advertising, promotions and public relations	27,677	28,858	28,998
Professional services	26,664	26,283	27,365
Check card expense	15,572	13,008	11,923
Travel/meals and entertainment	14,393	15,346	14,813
Other	94,682	82,066	84,557
Total other non-interest expense	$ 178,988	$ 165,561	$ 167,656