CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
INTEREST AND DIVIDEND INCOME
Loans receivable, including fees		$ 968,625	$ 1,059,205	$ 979,394
Available-for-sale investment securities		41,375	44,684	43,846
Resale agreements		19,799	20,323	21,236
Investment in FHLB and Federal Reserve Bank stock		6,077	6,272	6,869
Due from banks and short-term investments		17,939	23,214	17,340
Total interest and dividend income		1,053,815	1,153,698	1,068,685
INTEREST EXPENSE
Customer deposits		73,505	65,486	63,496
Short-term borrowings		58	0	6
FHLB advances		4,270	4,116	4,173
Repurchase agreements		20,907	38,395	41,381
Long-term debt		4,636	4,823	3,436
Total interest expense		103,376	112,820	112,492
Net interest income before provision for credit losses		950,439	1,040,878	956,193
Provision for credit losses		14,217	49,158	22,364
Net interest income after provision for credit losses		936,222	991,720	933,829
NONINTEREST INCOME (LOSS)
Branch fees		39,495	37,866	32,036
Letters of credit fees and foreign exchange income		38,985	37,323	34,774
Ancillary loan fees		15,029	10,616	9,368
Wealth management fees		18,268	16,162	10,878
Derivative commission income		16,193	12,753	8,813
Changes in Federal Deposit Insurance Corporation (“FDIC”) indemnification asset and receivable/payable		(37,980)	(201,417)	(228,585)
Net gains on sales of loans		24,874	39,132	7,750
Net gains on sales of available-for-sale investment securities		40,367	10,851	12,089
Other fees and other operating income		28,152	25,000	20,409
Total noninterest income (loss)		183,383	(11,714)	(92,468)
NONINTEREST EXPENSE
Compensation and employee benefits		262,193	231,838	175,906
Occupancy and equipment expense		61,292	63,815	56,641
Amortization of tax credit and other investments (1)	[1]	36,120	44,092	5,973
Amortization of premiums on deposits acquired		9,234	10,204	9,365
Deposit insurance premiums and regulatory assessments		18,772	21,922	16,550
Deposit related expenses		9,582	7,536	6,536
Other real estate owned (“OREO”) income		(8,914)	(3,591)	(1,128)
Legal expense		16,373	53,018	31,718
Data processing		10,185	15,888	9,095
Consulting expense		17,234	8,511	6,446
Repurchase agreements’ extinguishment costs		21,818	0	0
Other operating expense		86,995	79,750	77,113
Total noninterest expense	[1]	540,884	532,983	394,215
Income before income taxes	[1]	578,721	447,023	447,146
INCOME TAX EXPENSE	[1]	194,044	101,145	153,822
NET INCOME	[1]	384,677	345,878	293,324
PREFERRED STOCK DIVIDENDS		0	0	3,428
NET INCOME AVAILABLE TO COMMON STOCKHOLDERS	[1]	$ 384,677	$ 345,878	$ 289,896
EARNINGS PER SHARE AVAILABLE TO COMMON STOCKHOLDERS
BASIC (in dollars per share)	[1]	$ 2.67	$ 2.42	$ 2.10
DILUTED (in dollars per share)	[1]	$ 2.66	$ 2.41	$ 2.09
WEIGHTED AVERAGE NUMBER OF SHARES OUTSTANDING
BASIC (in shares)		143,818	142,952	137,342
DILUTED (in shares)		144,512	143,563	139,574
DIVIDENDS DECLARED PER COMMON SHARE (in dollars per share)		$ 0.80	$ 0.72	$ 0.60

[1] Prior period was restated to reflect the retrospective application of adopting the new accounting guidance related to the Company’s investments in qualified affordable housing projects Accounting Standards Update (“ASU”) 2014-01. Please see Note 9 — Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Net to the Consolidated Financial Statements for additional information.