Consolidated Statement of income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
INTEREST AND DIVIDEND INCOME
Loans receivable, including fees	$ 1,503,514	$ 1,198,440	$ 1,035,377
Investment debt securities	60,911
Investment debt and equity securities		58,670	53,399
Resale agreements	29,328	32,095	30,547
Restricted equity securities	3,146	2,524	3,427
Interest-bearing cash and deposits with banks	54,804	33,390	14,731
Total interest and dividend income	1,651,703	1,325,119	1,137,481
INTEREST EXPENSE
Deposits	234,752	116,391	84,224
Federal funds purchased and other short-term borrowings	1,398	1,003	713
FHLB advances	10,447	7,751	5,585
Repurchase agreements	12,110	9,476	9,304
Long-term debt	6,488	5,429	5,017
Total interest expense	265,195	140,050	104,843
Net interest income before provision for credit losses	1,386,508	1,185,069	1,032,638
Provision for credit losses	64,255	46,266	27,479
Net interest income after provision for credit losses	1,322,253	1,138,803	1,005,159
NONINTEREST INCOME
Branch fees	39,859	40,925	39,654
Letters of credit fees and foreign exchange income	56,282	44,344	47,284
Ancillary loan fees and other income	24,052	23,333	19,352
Wealth management fees	13,785	13,974	12,600
Derivative fees and other income	18,980	17,671	16,781
Net gains on sales of loans	6,590	8,870	6,085
Net gains on sales of available-for-sale debt investment securities	2,535
Net gains on sales of available-for-sale debt and equity securities		8,037	10,362
Net gains on sales of fixed assets	6,683	77,388	3,178
Net gain on sale of business	31,470	3,807	0
Other fees and operating income	10,673	19,399	26,982
Total noninterest income	210,909	257,748	182,278
NONINTEREST EXPENSE
Compensation and employee benefits	379,622	335,291	300,115
Occupancy and equipment expense	68,896	64,921	61,453
Deposit insurance premiums and regulatory assessments	21,211	23,735	23,279
Legal expense	8,781	11,444	2,841
Data processing	13,177	12,093	11,683
Consulting expense	11,579	14,922	22,742
Deposit related expense	11,244	9,938	10,394
Computer software expense	22,286	18,183	12,914
Other operating expense	88,042	82,974	86,382
Amortization of tax credit and other investments	89,628	87,950	83,446
Total noninterest expense	714,466	661,451	615,249
INCOME BEFORE INCOME TAXES	818,696	735,100	572,188
INCOME TAX EXPENSE	114,995	229,476	140,511
NET INCOME	$ 703,701	$ 505,624	$ 431,677
EARNINGS PER SHARE (“EPS”)
BASIC (in dollars per share)	$ 4.86	$ 3.50	$ 3.00
DILUTED (in dollars per share)	$ 4.81	$ 3.47	$ 2.97
WEIGHTED-AVERAGE NUMBER OF SHARES OUTSTANDING
BASIC (in shares)	144,862	144,444	144,087
DILUTED (in shares)	146,169	145,913	145,172