Consolidated Balance Sheet - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Assets
Cash and due from banks	$ 1,605,439	$ 1,420,888
Interest-bearing deposits at banks	8,105,197	5,078,903
Trading account	185,584	132,909
Investment securities (includes pledged securities that can be sold or repledged of $487,365 at December 31, 2018; $487,151 at December 31, 2017)
Available for sale (cost: $8,869,423 at December 31, 2018; $10,938,796 at December 31, 2017)	8,682,509	10,896,284
Held to maturity (fair value: $3,255,483 at December 31, 2018; $3,341,762 at December 31, 2017)	3,316,640	3,353,213
Equity and other securities (cost: $677,187 at December 31, 2018; $415,028 at December 31, 2017)	693,664	415,028
Total investment securities	12,692,813	14,664,525
Loans and leases	88,733,492	88,242,886
Unearned discount	(267,015)	(253,903)
Loans and leases, net of unearned discount	88,466,477	87,988,983
Allowance for credit losses	(1,019,444)	(1,017,198)
Loans and leases, net	87,447,033	86,971,785
Premises and equipment	647,408	646,451
Goodwill	4,593,112	4,593,112
Core deposit and other intangible assets	47,067	71,589
Accrued interest and other assets	4,773,750	5,013,325
Total assets	120,097,403	118,593,487
Liabilities
Noninterest-bearing deposits	32,256,668	33,975,180
Savings and interest-checking deposits	50,963,744	51,698,008
Time deposits	6,124,254	6,580,962
Deposits at Cayman Islands office	811,906	177,996
Total deposits	90,156,572	92,432,146
Short-term borrowings	4,398,378	175,099
Accrued interest and other liabilities	1,637,348	1,593,993
Long-term borrowings	8,444,914	8,141,430
Total liabilities	104,637,212	102,342,668
Shareholders' equity
Preferred stock, $1.00 par, 1,000,000 shares authorized; Issued and outstanding: Liquidation preference of $1,000 per share: 731,500 shares at December 31, 2018 and December 31, 2017; Liquidation preference of $10,000 per share: 50,000 shares at December 31, 2018 and December 31, 2017	1,231,500	1,231,500
Common stock, $.50 par, 250,000,000 shares authorized, 159,765,044 shares issued at December 31, 2018; 159,817,518 shares issued at December 31, 2017	79,883	79,909
Common stock issuable, 24,563 shares at December 31, 2018; 27,138 shares at December 31, 2017	1,726	1,847
Additional paid-in capital	6,579,342	6,590,855
Retained earnings	11,516,672	10,164,804
Accumulated other comprehensive income (loss), net	(420,081)	(363,814)
Treasury stock — common, at cost — 21,255,275 shares at December 31, 2018; 9,733,115 shares at December 31, 2017	(3,528,851)	(1,454,282)
Total shareholders’ equity	15,460,191	16,250,819
Total liabilities and shareholders’ equity	$ 120,097,403	$ 118,593,487