Consolidated Statement of income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
INTEREST AND DIVIDEND INCOME
Loans receivable, including fees	$ 1,717,415	$ 1,503,514	$ 1,198,440
Investment debt securities	67,838	60,911
Investment debt and equity securities			58,670
Resale agreements	27,819	29,328	32,095
Restricted equity securities	2,468	3,146	2,524
Interest-bearing cash and deposits with banks	66,760	54,804	33,390
Total interest and dividend income	1,882,300	1,651,703	1,325,119
INTEREST EXPENSE
Deposits	375,802	234,752	116,391
Federal funds purchased and other short-term borrowings	1,763	1,398	1,003
FHLB advances	16,697	10,447	7,751
Repurchase agreements	13,582	12,110	9,476
Long-term debt and finance lease liabilities	6,643	6,488	5,429
Total interest expense	414,487	265,195	140,050
Net interest income before provision for credit losses	1,467,813	1,386,508	1,185,069
Provision for credit losses	98,685	64,255	46,266
Net interest income after provision for credit losses	1,369,128	1,322,253	1,138,803
NONINTEREST INCOME
Lending fees	63,670	59,758	58,395
Deposit account fees	38,648	39,176	40,299
Foreign exchange income	26,398	21,259	9,908
Wealth management fees	16,668	13,785	13,974
Interest rate contracts and other derivative income	39,865	18,980	17,671
Net gains on sales of loans	4,035	6,590	8,870
Net gains on sales of AFS debt investment securities	3,930	2,535
Net gains on sales of AFS debt and equity investment securities			8,037
Net gains on sales of fixed assets	114	6,683	77,388
Net gain on sale of business	0	31,470	3,807
Other investment income	5,249	1,207	3,903
Other income	10,800	9,466	15,496
Total noninterest income	209,377	210,909	257,748
NONINTEREST EXPENSE
Compensation and employee benefits	401,700	379,622	335,291
Occupancy and equipment expense	69,730	68,896	64,921
Deposit insurance premiums and regulatory assessments	12,928	21,211	23,735
Legal expense	8,441	8,781	11,444
Data processing	13,533	13,177	12,093
Consulting expense	9,846	11,579	14,922
Deposit related expense	14,175	11,244	9,938
Computer software expense	26,471	22,286	18,183
Other operating expense	92,249	88,042	82,974
Amortization of tax credit and other investments	85,515	89,628	87,950
Total noninterest expense	734,588	714,466	661,451
INCOME BEFORE INCOME TAXES	843,917	818,696	735,100
INCOME TAX EXPENSE	169,882	114,995	229,476
NET INCOME	$ 674,035	$ 703,701	$ 505,624
EARNINGS PER SHARE (“EPS”)
BASIC (in dollars per share)	$ 4.63	$ 4.86	$ 3.50
DILUTED (in dollars per share)	$ 4.61	$ 4.81	$ 3.47
WEIGHTED-AVERAGE NUMBER OF SHARES OUTSTANDING
BASIC (in shares)	145,497	144,862	144,444
DILUTED (in shares)	146,179	146,169	145,913