Interim Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Interest income:
Loans	$ 205,287	$ 167,252	$ 403,229	$ 332,753
Investment securities:
Taxable	86,603	84,613	177,653	165,887
Non-taxable	575	741	1,171	1,513
Federal funds sold, securities purchased under agreements to resell and other short-term investment securities	1,527	1,320	3,597	2,589
Total interest income	293,992	253,926	585,650	502,742
Interest expense:
Deposits	1,261	1,182	2,449	3,125
Borrowings	9,395	8,973	18,444	16,921
Total interest expense	10,656	10,155	20,893	20,046
Net interest income	283,336	243,771	564,757	482,696
Provision for loan losses	36,333	26,513	69,674	32,965
Net interest income after provision for loan losses	247,003	217,258	495,083	449,731
Noninterest income:
Gains on investment securities, net	23,270	24,975	18,586	58,238
Gains on derivative instruments, net	8,798	16,317	7,103	56,046
Foreign exchange fees	24,088	22,364	51,054	40,042
Credit card fees	15,424	14,215	30,931	26,305
Deposit service charges	13,114	11,301	25,786	22,037
Client investment fees	8,012	5,264	16,007	9,746
Lending related fees	7,802	8,163	15,615	16,185
Letters of credit and standby letters of credit fees	6,014	4,772	11,603	9,974
Other	6,254	18,916	22,225	11,238
Total noninterest income	112,776	126,287	198,910	249,811
Noninterest expense:
Compensation and benefits	115,580	124,915	237,842	240,685
Professional services	25,516	18,950	44,516	37,697
Premises and equipment	16,586	11,787	31,570	24,444
Business development and travel	9,327	9,764	21,573	20,876
Net occupancy	9,359	8,149	19,394	15,462
FDIC and state assessments	6,892	5,962	13,819	11,751
Correspondent bank fees	2,713	3,337	6,365	6,705
Provision for (reduction of) unfunded credit commitments	413	(3,061)	547	(798)
Other	13,966	14,309	28,759	27,831
Total noninterest expense	200,352	194,112	404,385	384,653
Income before income tax expense	159,427	149,433	289,608	314,889
Income tax expense	65,047	54,974	118,631	118,040
Net income before noncontrolling interests	94,380	94,459	170,977	196,849
Net (income) loss attributable to noncontrolling interests	(1,416)	(8,316)	1,161	(22,190)
Net income available to common stockholders	$ 92,964	$ 86,143	$ 172,138	$ 174,659
Earnings per common share—basic (dollars per share)	$ 1.79	$ 1.68	$ 3.33	$ 3.42
Earnings per common share—diluted (dollars per share)	$ 1.78	$ 1.66	$ 3.30	$ 3.37