Interim Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Interest income:
Loans	$ 147,680	$ 131,785	$ 295,852	$ 255,529
Investment securities:
Taxable	63,424	44,657	117,844	90,409
Non-taxable	794	807	1,590	1,606
Federal funds sold, securities purchased under agreements to resell and other short-term investment securities	1,943	734	3,579	1,453
Total interest income	213,841	177,983	418,865	348,997
Interest expense:
Deposits	3,068	2,085	5,972	4,136
Borrowings	5,808	5,817	11,600	11,611
Total interest expense	8,876	7,902	17,572	15,747
Net interest income	204,965	170,081	401,293	333,250
Provision for loan losses	1,947	18,572	2,441	24,385
Net interest income after provision for loan losses	203,018	151,509	398,852	308,865
Noninterest income:
(Losses) gains on investment securities, net	(57,320)	40,561	166,592	67,999
Credit card fees	17,928	13,667	35,124	27,863
Gains on derivative instruments, net	12,775	8,087	36,942	18,379
Credit card fees	10,249	7,609	20,531	15,057
Deposit service charges	9,611	8,907	19,218	17,700
Lending related fees	5,876	4,596	12,179	8,570
Client investment fees	3,519	3,524	6,937	6,999
Letters of credit and standby letters of credit fees	2,810	3,654	6,950	7,089
Other	8,762	7,634	19,962	7,187
Total noninterest income	14,210	98,239	324,435	176,843
Noninterest expense:
Compensation and benefits	99,820	84,742	202,327	173,446
Professional services	21,113	16,633	42,302	33,793
Premises and equipment	12,053	11,402	23,635	22,127
Business development and travel	9,249	7,783	19,443	16,055
Net occupancy	7,680	5,795	15,000	11,562
FDIC assessments	4,945	2,853	9,073	6,235
Correspondent bank fees	3,274	3,049	6,477	6,104
Provision for unfunded credit commitments	2,185	1,347	3,308	3,361
Other	13,127	9,688	24,317	19,623
Total noninterest expense	173,446	143,292	345,882	292,306
Income before income tax expense	43,782	106,456	377,405	193,402
Income tax expense	33,582	29,968	92,499	56,369
Net income before noncontrolling interests	10,200	76,488	284,906	137,033
Net loss (income) attributable to noncontrolling interests	40,597	(27,904)	(142,808)	(47,558)
Net income available to common stockholders	$ 50,797	$ 48,584	$ 142,098	$ 89,475
Earnings per common share—basic (dollars per share)	$ 1.05	$ 1.08	$ 3.02	$ 1.99
Earnings per common share—diluted (dollars per share)	$ 1.04	$ 1.06	$ 2.96	$ 1.96