Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
OPERATIONS:
Net interest income	$ 203,340	$ 117,890	$ 512,717	$ 355,600
Provision for Loan, Lease, and Other Losses	6,379	16,179	23,634	42,436
Noninterest Income	71,090	54,925	197,923	161,952
Other expenses	211,378	108,587	507,943	341,432
Net income	40,715	34,953	126,510	95,882
AVERAGES :
Assets	24,013,594	14,734,016	20,632,658	14,596,526
Total commercial
OPERATIONS:
Net interest income	106,443	65,446	277,468	193,776
Provision for Loan, Lease, and Other Losses	(27)	10,401	6,866	22,970
Noninterest Income	21,364	15,247	60,980	47,603
Other expenses	57,033	39,595	151,587	123,074
Net income	46,021	19,954	116,997	61,967
AVERAGES :
Assets	8,685,333	6,466,355	8,020,824	6,386,617
Retail
OPERATIONS:
Net interest income	99,548	51,181	239,922	158,745
Provision for Loan, Lease, and Other Losses	905	1,194	7,071	5,459
Noninterest Income	30,723	26,783	88,916	76,226
Other expenses	96,153	53,788	235,518	169,618
Net income	21,589	14,939	56,061	38,931
AVERAGES :
Assets	5,659,553	2,960,336	4,646,817	2,929,911
Wealth
OPERATIONS:
Net interest income	3,613	4,223	11,162	13,412
Provision for Loan, Lease, and Other Losses	(736)	(519)	(570)	(318)
Noninterest Income	13,216	8,528	34,347	24,987
Other expenses	14,650	9,711	38,698	29,718
Net income	1,894	2,313	4,796	5,849
AVERAGES :
Assets	266,028	242,539	255,538	238,899
Nonreportable segments and reconciling items
OPERATIONS:
Net interest income	(6,264)	(2,960)	(15,835)	(10,333)
Provision for Loan, Lease, and Other Losses	6,237	5,103	10,267	14,325
Noninterest Income	5,787	4,367	13,680	13,136
Other expenses	43,542	5,493	82,140	19,022
Net income	(28,789)	(2,253)	(51,344)	(10,865)
AVERAGES :
Assets	$ 9,402,680	$ 5,064,786	$ 7,709,479	$ 5,041,099