CONSOLIDATED BALANCE SHEETS (unaudited) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Assets [Abstract]
Cash and due from banks	$ 578,026	$ 535,846
Interest-bearing funds with Federal Reserve Bank	1,266,313	553,390
Interest earning deposits with banks	20,929	20,635
Federal funds sold and securities purchased under resale agreements	120,095	77,047
Total cash, cash equivalents, restricted cash, and restricted cash equivalents	1,985,363	1,186,918
Investment securities available for sale, at fair value	7,566,525	6,778,670
Loans held for sale (includes $285,899 and $115,173 measured at fair value, respectively)	745,160	115,173
Loans, net of deferred fees and costs	39,549,847	37,162,450
Allowance for loan losses	(603,800)	(281,402)
Cash surrender value of bank-owned life insurance	1,044,046	775,665
Premises and equipment, net	471,208	493,940
Goodwill	452,390	497,267
Other intangible assets, net	47,752	55,671
Other assets	1,782,047	1,418,930
Total assets	53,040,538	48,203,282
Deposits:
Non-interest-bearing deposits	13,075,081	9,439,485
Interest-bearing deposits	31,590,823	28,966,019
Total deposits	44,665,904	38,405,504
Federal funds purchased and securities sold under repurchase agreements	202,344	165,690
Other short-term borrowings	400,000	1,753,560
Long-term debt	1,628,385	2,153,897
Other liabilities	1,079,363	782,941
Total liabilities	47,975,996	43,261,592
Shareholders' Equity
Preferred stock - no par value; authorized 100,000,000 shares; issued 22,000,000	537,145	537,145
Common stock - $1.00 par value; authorized 342,857,143 shares; issued 167,410,950 and 166,800,623; outstanding 147,317,923 and 147,157,596	167,411	166,801
Additional paid-in capital	3,832,142	3,819,336
Treasury stock, at cost; 20,093,027 and 19,643,027 shares	(731,806)	(715,560)
Accumulated other comprehensive income, net	174,914	65,641
Retained earnings	1,084,736	1,068,327
Total shareholders' equity	5,064,542	4,941,690
Total liabilities and shareholders' equity	$ 53,040,538	$ 48,203,282