Consolidated Balance Sheet (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Assets
Cash and due from banks	$ 1,367,594	$ 1,420,888
Interest-bearing deposits at banks	6,669,985	5,078,903
Federal funds sold	1,500
Trading account	148,303	132,909
Investment securities (includes pledged securities that can be sold or repledged of $473,505 at June 30, 2018; $487,151 at December 31, 2017)
Available for sale (cost: $9,912,160 at June 30, 2018; $10,938,796 at December 31, 2017)	9,658,846	10,896,284
Held to maturity (fair value: $3,022,329 at June 30, 2018; $3,341,762 at December 31, 2017)	3,101,095	3,353,213
Equity and other securities (cost: $507,389 at June 30, 2018; $415,028 at December 31, 2017)	523,061	415,028
Total investment securities	13,283,002	14,664,525
Loans and leases	88,059,392	88,242,886
Unearned discount	(261,942)	(253,903)
Loans and leases, net of unearned discount	87,797,450	87,988,983
Allowance for credit losses	(1,019,248)	(1,017,198)
Loans and leases, net	86,778,202	86,971,785
Premises and equipment	637,809	646,451
Goodwill	4,593,112	4,593,112
Core deposit and other intangible assets	58,569	71,589
Accrued interest and other assets	4,887,977	5,013,325
Total assets	118,426,053	118,593,487
Liabilities
Noninterest-bearing deposits	32,086,191	33,975,180
Savings and interest-checking deposits	51,107,290	51,698,008
Time deposits	5,817,680	6,580,962
Deposits at Cayman Islands office	261,427	177,996
Total deposits	89,272,588	92,432,146
Short-term borrowings	3,239,416	175,099
Accrued interest and other liabilities	1,953,848	1,593,993
Long-term borrowings	8,382,316	8,141,430
Total liabilities	102,848,168	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 June 30, 2018 and December 31, 2017; Liquidation preference of $10,000 per share: 50,000 shares at June 30, 2018 and December 31, 2017	1,231,500	1,231,500
Common stock, $.50 par, 250,000,000 shares authorized, 159,767,147 shares issued at June 30, 2018; 159,817,518 shares issued at December 31, 2017	79,884	79,909
Common stock issuable, 24,447 shares at June 30, 2018; 27,138 shares at December 31, 2017	1,691	1,847
Additional paid-in capital	6,579,395	6,590,855
Retained earnings	10,763,638	10,164,804
Accumulated other comprehensive income (loss), net	(517,941)	(363,814)
Treasury stock — common, at cost — 15,530,445 shares at June 30, 2018; 9,733,115 shares at December 31, 2017	(2,560,282)	(1,454,282)
Total shareholders’ equity	15,577,885	16,250,819
Total liabilities and shareholders’ equity	$ 118,426,053	$ 118,593,487