Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019
Cash and cash equivalents:
Cash and due from banks	$ 380,661	$ 262,019	$ 251,631
Federal funds sold and interest-bearing deposits with banks	3,109,853	377,692	556,991
Deposits in other financial institutions (restricted cash)	873,194	48,993	43,349
Total cash and cash equivalents	4,363,708	688,704	851,971
Trading securities, at fair value	494
Investment securities:
Securities available for sale, at fair value (Cost of $3,075,776 and allowance for credit losses of $0 for June 30, 2020)	3,137,718	1,956,047	1,717,276
Other investments	133,430	49,124	49,124
Total investment securities	3,271,148	2,005,171	1,766,400
Investment Available For Sale	3,271,148	2,005,171	1,766,400
Loans held for sale	603,275	59,363	47,796
Loans:
Total loans - ASU 2016-13	25,499,147
Total loans		11,375,104	11,226,192
Less allowance for credit losses	(434,608)	(56,927)	(53,590)
Loans, net	25,064,539	11,313,113	11,167,979
Other real estate owned	18,016	6,539	8,721
Bank property held for sale	25,541	5,425	5,785
Premises and equipment, net	627,943	317,321	321,348
Bank owned life insurance	556,807	234,567	231,708
Deferred tax assets	107,532	31,316	28,240
Derivatives assets	978,257	15,463	17,587
Mortgage servicing rights	25,441	30,525	30,332
Core deposit and other intangibles	170,911	49,816	56,351
Goodwill	1,603,383	1,002,900	1,002,900
Other assets	308,361	160,869	146,219
Total assets	37,725,356	15,921,092	15,683,337
Deposits:
Noninterest-bearing	9,915,700	3,245,306	3,255,906
Interest-bearing	20,041,585	8,931,790	8,666,374
Total deposits	29,957,285	12,177,096	11,922,280
Federal funds purchased	362,347	56,581	37,654
Securities sold under agreements to repurchase	358,132	242,160	260,375
Corporate and subordinated debentures	389,180	115,833	115,500
Other borrowings	700,099	700,103	700,914
Reserve for unfunded commitments	21,051	335	335
Derivative liabilities	1,017,933	30,485	30,286
Other liabilities	427,479	225,486	242,015
Total liabilities	33,233,506	13,548,079	13,309,359
Shareholders' equity:
Common stock - $2.50 par value; authorized 160,000,000, 80,000,000 and 80,000,000 shares; 70,907,119, 33,744,385 and 34,735,587 shares issued and outstanding, respectively	177,268	84,361	86,839
Surplus	3,759,166	1,607,740	1,676,229
Retained earnings	542,677	679,895	609,444
Accumulated other comprehensive income	12,739	1,017	1,466
Total shareholders' equity	4,491,850	2,373,013	2,373,978
Total liabilities and shareholders' equity	37,725,356	15,921,092	15,683,337
Acquired - non-purchased credit deteriorated loans
Loans:
Total loans - ASU 2016-13	11,577,833
Total loans		1,760,427	2,180,281
Acquired - purchased credit deteriorated loans (formerly acquired credit-impaired loans)
Loans:
Total loans - ASU 2016-13	3,323,754
Total loans		356,782	419,961
Non-acquired loans
Loans:
Total loans - ASU 2016-13	$ 10,597,560
Total loans		9,252,831	8,621,327
Less allowance for credit losses		(56,927)	(53,590)
Loans, net		$ 9,195,904	$ 8,567,737