Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017		Dec. 31, 2016		Dec. 31, 2015
Interest income:
Loans	$ 1,025,788		$ 834,155		$ 693,147
Investment securities:
Taxable	412,133		346,937		344,646
Non-taxable	5,714		2,234		2,905
Federal funds sold, securities purchased under agreements to resell and other short-term investment securities	21,505		10,070		6,067
Total interest income	1,465,140		1,193,396		1,046,765
Interest expense:
Deposits	8,676		5,611		5,447
Borrowings	36,095		37,262		34,893
Total interest expense	44,771		42,873		40,340
Net interest income	1,420,369		1,150,523		1,006,425
Provision for loan losses	85,939		95,697		97,629
Provision for Loan and Lease Losses	92,304		106,679	[1]	95,683	[1]
Net interest income after provision for loan losses	1,328,065		1,043,844		910,742
Noninterest income:
Gains on investment securities, net	64,603		51,740		89,445
Gains on derivative instruments, net	54,555		37,892		70,963
Foreign exchange fees	115,760		104,183		87,007
Credit card fees	76,543		68,205		56,657
Deposit service charges	58,715		52,524		46,683
Fees and Commissions	43,265		33,395		32,536
Letters of credit and standby letters of credit fees	28,544		25,644		20,889
Asset Management Fees	56,136		32,219		21,610
Other	59,110		50,750		47,004
Noninterest Income	557,231		456,552		472,794
Noninterest expense:
Compensation and benefits	606,402		514,270		473,841
Professional services	121,935		94,982		82,839
Premises and equipment	71,753		65,502		51,927
Business development and travel	41,978		40,130		39,524
Net occupancy	48,397		39,928		34,674
FDIC assessments	35,069		30,285		25,455
Correspondent bank fees	12,976		12,457		13,415
Other	72,145		62,243		58,287
Total noninterest expense	1,010,655		859,797	[1]	779,962	[1]
Income before income tax expense	874,641		640,599		603,574
Income tax expense	355,463	[2]	250,333		228,754
Net income before noncontrolling interests	519,178		390,266		374,820
Net income attributable to noncontrolling interests	(28,672)		(7,581)		(30,916)
Net income available to common stockholders	$ 490,506	[2]	$ 382,685		$ 343,904
Earnings per common share—basic, in dollars per share	$ 9.33	[2]	$ 7.37		$ 6.70
Earnings per common share—diluted, in dollars per share	$ 9.20	[2]	$ 7.31		$ 6.62

[1] Our consolidated statements of income for the years ended December 31, 2016 and 2015 were modified from prior periods’ presentation to conform to the current period's presentation, which reflects our provision for loan losses and provision for unfunded credit commitments together as our “provision for credit losses”. In prior periods, our provision for unfunded credit commitments were reported separately as a component of noninterest expense.

[2] Included in income tax expense, net income available to common stockholders, earnings per common share-basic and earnings for common share-diluted, for the year ended December 31, 2017, are tax benefits recognized associated with the adoption of Accounting Standards Update ("ASU") 2016-09, Improvements to Employee Share-Based Payment Accounting in the first quarter of 2017. This guidance was adopted on a prospective basis with no change to prior period amounts.