Note Loans (Changes in the carrying amount and the accretable yield for the acquired loans) (Detail) - ASC Subtopic 310-30 - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Accretable yield
Beginning Balance		$ 1,204,726	$ 1,290,984	$ 1,214,488	$ 1,288,983
Additions		0	2,601	3,437	5,855
Accretion		(40,806)	(44,910)	(82,866)	(90,638)
Change In Expected Cash Flows		14,122	(3,003)	42,983	41,472
Ending Balance	[1]	1,178,042	1,245,672	1,178,042	1,245,672
Carrying amount of loans
Beginning Balance		2,085,191	2,245,624	2,108,993	2,301,024
Additions		0	4,298	5,272	9,879
Accretion		40,806	44,910	82,866	90,638
Collections / loan sales / charge-offs		(92,540)	(126,168)	(163,674)	(232,877)
Ending Balance	[2]	2,033,457	2,168,664	2,033,457	2,168,664
Less: Allowance for loan losses		(156,328)	(103,597)	(156,328)	(103,597)
Carrying amount, net of allowance		$ 1,877,129	$ 2,065,067	$ 1,877,129	$ 2,065,067

[1] At June 30, 2018, includes $0.9 billion of loans considered non-credit impaired at the acquisition date (June 30, 2017 - $0.9 billion).

[2] At June 30, 2018, includes $1.5 billion of loans considered non-credit impaired at the acquisition date (June 30, 2017 - $1.6 billion).