CONSOLIDATED CONDENSED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Interest income:
Interest and fees on loans	$ 352,112	$ 323,974	$ 684,050	$ 623,467
Interest on investment securities available-for-sale	31,247	32,634	63,090	65,481
Interest on investment securities held-to-maturity	132	132	263	263
Interest on loans held-for-sale	8,128	11,228	18,005	23,372
Interest on trading securities	13,154	14,742	26,702	29,150
Interest on other earning assets	7,316	5,101	20,594	9,433
Total interest income	412,089	387,811	812,704	751,166
Interest on deposits:
Savings	36,806	25,600	76,720	40,500
Time deposits	22,439	11,236	42,693	20,761
Other interest-bearing deposits	19,757	11,913	41,799	22,521
Interest on trading liabilities	3,756	4,790	6,572	9,914
Interest on short-term borrowings	11,038	10,110	17,782	20,152
Interest on term borrowings	14,683	13,230	29,020	25,213
Total interest expense	108,479	76,879	214,586	139,061
Net interest income	303,610	310,932	598,118	612,105
Provision/(provision credit) for loan losses	13,000	0	22,000	(1,000)
Net interest income after provision/(provision credit) for loan losses	290,610	310,932	576,118	613,105
Noninterest income:
Fixed income	66,414	37,697	120,163	83,203
Deposit transactions and cash management	32,374	36,083	63,995	72,067
Brokerage, management fees and commissions	14,120	13,740	26,753	27,223
Trust services and investment management	7,888	8,132	14,914	15,409
Bankcard income	6,355	7,195	13,307	13,990
Bank-owned life insurance (BOLI)	5,126	5,773	9,528	9,766
Debt securities gains/(losses), net	(267)	0	(267)	52
Equity securities gains/(losses), net (Note 3)	316	31	347	65
All other income and commissions (Note 8)	25,667	18,874	50,298	41,767
Total noninterest income	157,993	127,525	299,038	263,542
Adjusted gross income after provision/(provision credit) for loan losses	448,603	438,457	875,156	876,647
Noninterest expense:
Employee compensation, incentives, and benefits	171,643	165,890	349,568	337,144
Occupancy	20,719	22,503	41,412	42,954
Computer software	15,001	15,123	30,140	30,255
Operations services	11,713	14,653	23,201	30,214
Professional fees	11,291	15,415	23,590	27,687
Equipment rentals, depreciation, and maintenance	8,375	10,708	17,204	20,726
Communications and courier	7,380	7,530	13,833	15,762
Legal fees	6,486	2,784	9,317	5,129
Amortization of intangible assets	6,206	6,460	12,422	12,934
Advertising and public relations	5,574	5,070	12,816	8,669
FDIC premium expense	4,247	9,978	8,520	18,592
Contract employment and outsourcing	3,078	5,907	6,449	9,960
Repurchase and foreclosure provision/(provision credit)	(530)	(252)	(985)	(324)
All other expense (Note 8)	29,211	50,999	48,997	86,331
Total noninterest expense	300,394	332,768	596,484	646,033
Income/(loss) before income taxes	148,209	105,689	278,672	230,614
Provision/(benefit) for income taxes	34,467	19,697	61,525	49,628
Net income/(loss)	113,742	85,992	217,147	180,986
Net income attributable to noncontrolling interest	2,852	2,852	5,672	5,672
Net income/(loss) attributable to controlling interest	110,890	83,140	211,475	175,314
Preferred stock dividends	1,550	1,550	3,100	3,100
Net income/(loss) available to common shareholders	$ 109,340	$ 81,590	$ 208,375	$ 172,214
Basic earnings/(loss) per share (in dollars per share)	$ 0.35	$ 0.25	$ 0.66	$ 0.53
Diluted earnings/(loss) per share (in dollars per share)	$ 0.35	$ 0.25	$ 0.66	$ 0.52
Weighted average common shares (in shares)	314,063	325,153	315,740	325,817
Diluted average common shares (in shares)	315,786	328,426	317,720	329,353
Cash dividends declared per common share (in dollars per share)	$ 0.14	$ 0.12	$ 0.28	$ 0.24