CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
INTEREST AND DIVIDEND INCOME
Loans receivable, including fees	$ 1,035,377	$ 968,625	$ 1,059,205
Investment securities	53,399	41,375	44,684
Resale agreements	30,547	19,799	20,323
Investments in FHLB and Federal Reserve Bank stock	3,427	6,077	6,272
Interest-bearing cash and deposits with banks	14,731	17,939	23,214
Total interest and dividend income	1,137,481	1,053,815	1,153,698
INTEREST EXPENSE
Customer deposits	84,224	73,505	65,486
Federal funds purchased and other short-term borrowings	713	58	0
FHLB advances	5,585	4,270	4,116
Repurchase agreements	9,304	20,907	38,395
Long-term debt	5,017	4,636	4,823
Total interest expense	104,843	103,376	112,820
Net interest income before provision for credit losses	1,032,638	950,439	1,040,878
Provision for credit losses	27,479	14,217	49,158
Net interest income after provision for credit losses	1,005,159	936,222	991,720
NONINTEREST INCOME (LOSS)
Branch fees	41,178	39,495	37,866
Letters of credit fees and foreign exchange income	45,760	38,985	37,323
Ancillary loan fees	19,352	15,029	10,616
Wealth management fees	13,240	18,268	16,162
Derivative fees and other income	16,781	16,493	10,991
Net gains on sales of loans	6,087	24,874	39,132
Net gains on sales of available-for-sale investment securities	10,362	40,367	10,715
Changes in Federal Deposit Insurance Corporation (“FDIC”) indemnification asset and receivable/payable	0	(37,980)	(201,417)
Other fees and operating income	30,158	27,852	26,898
Total noninterest income (loss)	182,918	183,383	(11,714)
NONINTEREST EXPENSE
Compensation and employee benefits	300,115	262,193	231,838
Occupancy and equipment expense	61,453	61,292	63,815
Deposit insurance premiums and regulatory assessments	23,279	18,772	21,922
Other real estate owned (“OREO”) expense (income)	1,474	(8,914)	(3,591)
Legal expense	2,841	16,373	53,018
Data processing	11,683	10,185	15,888
Consulting expense	22,742	17,234	8,511
Deposit related expenses	10,394	10,379	8,452
Computer software expense	12,914	8,660	7,493
Other operating expense	77,462	77,538	71,341
Amortization of tax credit and other investments	83,446	36,120	44,092
Amortization of core deposit intangibles	8,086	9,234	10,204
Repurchase agreements’ extinguishment costs	0	21,818	0
Total noninterest expense	615,889	540,884	532,983
INCOME BEFORE INCOME TAXES	572,188	578,721	447,023
INCOME TAX EXPENSE	140,511	194,044	101,145
NET INCOME	$ 431,677	$ 384,677	$ 345,878
EARNINGS PER SHARE (“EPS”)
BASIC (in dollars per share)	$ 3.00	$ 2.67	$ 2.42
DILUTED (in dollars per share)	$ 2.97	$ 2.66	$ 2.41
WEIGHTED AVERAGE NUMBER OF SHARES OUTSTANDING
BASIC (in shares)	144,087	143,818	142,952
DILUTED (in shares)	145,172	144,512	143,563
DIVIDENDS DECLARED PER COMMON SHARE (in dollars per share)	$ 0.80	$ 0.80	$ 0.72