Consolidated Balance Sheet (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Assets
Cash and due from banks	$ 1,311,611	$ 1,420,888
Interest-bearing deposits at banks	6,523,746	5,078,903
Trading account	125,038	132,909
Investment securities (includes pledged securities that can be sold or repledged of $477,609 at September 30, 2018; $487,151 at December 31, 2017)
Available for sale (cost: $9,449,975 at September 30, 2018; $10,938,796 at December 31, 2017)	9,154,515	10,896,284
Held to maturity (fair value: $3,313,270 at September 30, 2018; $3,341,762 at December 31, 2017)	3,418,719	3,353,213
Equity and other securities (cost: $488,389 at September 30, 2018; $415,028 at December 31, 2017)	500,647	415,028
Total investment securities	13,073,881	14,664,525
Loans and leases	86,942,468	88,242,886
Unearned discount	(261,983)	(253,903)
Loans and leases, net of unearned discount	86,680,485	87,988,983
Allowance for credit losses	(1,019,488)	(1,017,198)
Loans and leases, net	85,660,997	86,971,785
Premises and equipment	634,424	646,451
Goodwill	4,593,112	4,593,112
Core deposit and other intangible assets	52,426	71,589
Accrued interest and other assets	4,852,402	5,013,325
Total assets	116,827,637	118,593,487
Liabilities
Noninterest-bearing deposits	31,773,560	33,975,180
Savings and interest-checking deposits	51,108,962	51,698,008
Time deposits	5,810,587	6,580,962
Deposits at Cayman Islands office	447,287	177,996
Total deposits	89,140,396	92,432,146
Short-term borrowings	1,310,110	175,099
Accrued interest and other liabilities	1,800,778	1,593,993
Long-term borrowings	9,140,268	8,141,430
Total liabilities	101,391,552	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 September 30, 2018 and December 31, 2017; Liquidation preference of $10,000 per share: 50,000 shares at September 30, 2018 and December 31, 2017	1,231,500	1,231,500
Common stock, $.50 par, 250,000,000 shares authorized, 159,765,948 shares issued at September 30, 2018; 159,817,518 shares issued at December 31, 2017	79,883	79,909
Common stock issuable, 24,595 shares at September 30, 2018; 27,138 shares at December 31, 2017	1,716	1,847
Additional paid-in capital	6,585,447	6,590,855
Retained earnings	11,128,343	10,164,804
Accumulated other comprehensive income (loss), net	(542,399)	(363,814)
Treasury stock — common, at cost — 18,312,024 shares at September 30, 2018; 9,733,115 shares at December 31, 2017	(3,048,405)	(1,454,282)
Total shareholders’ equity	15,436,085	16,250,819
Total liabilities and shareholders’ equity	$ 116,827,637	$ 118,593,487