CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Interest income:
Interest and fees on loans	$ 1,394,442	$ 1,286,470	$ 816,806
Interest on investment securities available-for-sale	120,558	130,376	105,019
Interest on investment securities held-to-maturity	525	525	591
Interest on loans held-for-sale	31,127	45,108	17,517
Interest on trading securities	46,576	58,684	34,991
Interest on other earning assets	31,112	24,858	15,006
Total interest income	1,624,340	1,546,021	989,930
Interest on deposits:
Savings	144,350	107,748	42,519
Time deposits	84,027	53,096	13,111
Other interest-bearing deposits	78,839	55,707	24,481
Interest on trading liabilities	12,502	19,359	15,468
Interest on short-term borrowings	41,172	36,747	16,000
Interest on term borrowings	53,263	53,047	36,037
Total interest expense	414,153	325,704	147,616
Net interest income	1,210,187	1,220,317	842,314
Provision/(provision credit) for loan losses	47,000	7,000	0
Net interest income after provision/(provision credit) for loan losses	1,163,187	1,213,317	842,314
Noninterest income:
Fixed income	278,789	167,882	216,625
Deposit transactions and cash management	131,663	133,281	110,592
Brokerage, management fees and commissions	55,467	54,803	48,514
Trust services and investment management	29,511	29,806	28,420
Bankcard income	28,308	29,304	26,435
Bank-owned life insurance (BOLI)	19,210	18,955	15,124
Debt securities gains/(losses), net (Note 3 and Note 14)	(267)	52	483
Equity securities gains/(losses), net (Note 3)	441	212,896	109
All other income and commissions (Note 13)	110,958	75,809	43,917
Total noninterest income	654,080	722,788	490,219
Adjusted gross income after provision/(provision credit) for loan losses	1,817,267	1,936,105	1,332,533
Noninterest expense:
Employee compensation, incentives, and benefits	695,351	658,223	587,465
Occupancy	80,271	85,009	54,646
Computer software	60,721	60,604	48,234
Professional fees	55,218	45,799	47,929
Operations services	46,006	56,280	43,823
Advertising and public relations	34,359	24,752	19,214
Equipment rentals, depreciation, and maintenance	33,998	39,132	29,543
Communications and courier	25,080	30,032	17,624
Amortization of intangible assets	24,834	25,855	8,728
FDIC premium expense	19,890	31,642	26,818
Legal fees	16,880	11,149	12,076
Contract employment and outsourcing	12,865	18,522	14,954
All other expense (Note 13)	126,130	134,997	112,607
Total noninterest expense	1,231,603	1,221,996	1,023,661
Income/(loss) before income taxes	585,664	714,109	308,872
Provision/(benefit) for income taxes (Note 15)	133,291	157,602	131,892
Net income/(loss)	452,373	556,507	176,980
Net income attributable to noncontrolling interest	11,465	11,465	11,465
Net income/(loss) attributable to controlling interest	440,908	545,042	165,515
Preferred stock dividends	6,200	6,200	6,200
Net income/(loss) available to common shareholders	$ 434,708	$ 538,842	$ 159,315
Basic earnings/(loss) per share (Note 16) (in dollars per share)	$ 1.39	$ 1.66	$ 0.66
Diluted earnings/(loss) per share (Note 16) (in dollars per share)	$ 1.38	$ 1.65	$ 0.65
Weighted average common shares (in shares)	313,637	324,375	241,436
Diluted average common shares (in shares)	315,657	327,445	244,453
Cash dividends declared per common share (in dollars per share)	$ 0.56	$ 0.48	$ 0.36