Consolidated Statements of Income - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015		Dec. 31, 2014		Dec. 31, 2013
Interest income:
Loans		$ 693,147		$ 610,945		$ 542,204
Investment securities:
Taxable		344,646		271,371		180,162
Non-taxable		2,905		3,136		3,201
Federal funds sold, securities purchased under agreements to resell and other short-term investment securities		6,067		6,464		4,054
Total interest income		1,046,765		891,916		729,621
Interest expense:
Deposits		5,447		12,114		9,128
Borrowings		34,893		23,207		23,149
Total interest expense		40,340		35,321		32,277
Net interest income		1,006,425		856,595		697,344
Provision for loan losses		97,629		59,486		63,693
Net interest income after provision for loan losses		908,796		797,109		633,651
Noninterest income:
Reclassification adjustment for (gains) losses included in net income		89,445	[1]	267,023		419,408
Gains on derivative instruments, net		83,805		96,845		42,184
Foreign exchange fees		87,007		71,659		57,411
Credit card fees		56,657		41,792		32,461
Deposit service charges		46,683		39,937		35,948
Lending related fees		32,536		25,711		20,980
Letters of credit and standby letters of credit fees		20,889		15,649		14,716
Client investment fees		21,610		14,883		13,959
Other		34,162		(1,260)		36,139
Total noninterest income		472,794		572,239		673,206
Noninterest expense:
Compensation and benefits		473,841		409,486		366,801
Professional services		82,839		94,377		76,178
Premises and equipment		51,927		49,716		45,935
Business development and travel		39,524		40,057		33,334
Net occupancy		34,674		30,004		24,937
FDIC assessments		25,455		19,206		12,784
Correspondent bank fees		13,415		13,118		12,142
(Reduction of) Provision for unfunded credit commitments		(1,946)		6,511		7,642
Other	[2]	58,287		44,705		35,491
Total noninterest expense	[2]	778,016		707,180		615,244
Income before income tax expense	[2]	603,574	[1]	662,168		691,613
Income tax expense	[2]	228,754		183,508		146,830
Net income before noncontrolling interests	[2],[3],[4]	374,820	[1]	478,660	[5],[6]	544,783	[5],[6]
Net income attributable to noncontrolling interests	[3]	(30,916)	[1]	(214,790)		(330,266)
Net income available to common stockholders	[2]	$ 343,904	[1]	$ 263,870		$ 214,517
Earnings per common share—basic, in dollars per share	[2]	$ 6.70		$ 5.39		$ 4.73
Earnings per common share—diluted, in dollars per share	[2]	$ 6.62		$ 5.31		$ 4.67

[1] During the second quarter of 2015 we adopted new accounting guidance related to our consolidated variable interest entities (ASU 2015-02). Amounts prior to January 1, 2015 have not been revised for the adoption of this guidance. See Note 2— "Summary of Significant Accounting Policies” of the “Notes to the Consolidated Financial Statements” under Part II, Item 8 of this report for additional details.

[2] Prior period amounts have been revised to reflect the retrospective application of new accounting guidance adopted in the first quarter of 2015 related to our investments in qualified affordable housing projects (ASU 2014-01). See Note 2— "Summary of Significant Accounting Policies” of the “Notes to the Consolidated Financial Statements” under Part II, Item 8 of this report for additional details.

[3] During the second quarter of 2015 we adopted new accounting guidance related to our consolidated variable interest entities (ASU 2015-02). Amounts prior to January 1, 2015 have not been revised for the adoption of this guidance. See Note 2— "Summary of Significant Accounting Policies” of the “Notes to the Consolidated Financial Statements” under Part II, Item 8 of this report for additional details.

[4] Prior period amounts have been revised to reflect the retrospective application of new accounting guidance adopted in the first quarter of 2015 related to our investments in qualified affordable housing projects (ASU 2014-01). See Note 2— "Summary of Significant Accounting Policies” of the “Notes to the Consolidated Financial Statements” under Part II, Item 8 of this report for additional details.

[5] Cash flows for the years ended December 31, 2014 and 2013 were revised to reflect the retrospective application of our adoption of ASU 2014-01.

[6] See Note 2— "Summary of Significant Accounting Policies-Adoptions of New Accounting Standards” of the “Notes to the Consolidated Financial Statements” under Part II, Item 8 of this report for additional details.