Note Other services fees (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Disclosure - Other Services Fees by Major Categories [Abstract]
Debit card fees	$ 11,543	$ 11,287
Insurance fees	12,805	12,850
Credit card fees	18,276	16,858
Sale and administration of investment products	5,082	4,839
Trust fees	4,955	4,235
Other fees	3,514	3,313
Total other services fees	$ 56,175	$ 53,382