Consolidated Balance Sheet (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Assets
Cash and due from banks	$ 1,286,962	$ 1,320,549
Interest-bearing deposits at banks	6,945,149	5,000,638
Trading account	174,854	323,867
Investment securities (includes pledged securities that can be sold or repledged of $519,063 at March 31, 2017; $1,203,473 at December 31, 2016)
Available for sale (cost: $12,640,244 at March 31, 2017; $13,338,301 at December 31, 2016)	12,631,000	13,332,072
Held to maturity (fair value: $2,865,885 at March 31, 2017; $2,451,222 at December 31, 2016)	2,876,119	2,457,278
Other (fair value: $461,296 at March 31, 2017; $461,118 at December 31, 2016)	461,296	461,118
Total investment securities	15,968,415	16,250,468
Loans and leases	89,555,547	91,101,677
Unearned discount	(242,545)	(248,261)
Loans and leases, net of unearned discount	89,313,002	90,853,416
Allowance for credit losses	(1,001,430)	(988,997)
Loans and leases, net	88,311,572	89,864,419
Premises and equipment	672,769	675,263
Goodwill	4,593,112	4,593,112
Core deposit and other intangible assets	94,535	97,655
Accrued interest and other assets	5,175,883	5,323,235
Total assets	123,223,251	123,449,206
Liabilities
Noninterest-bearing deposits	34,279,591	32,813,896
Savings and interest-checking deposits	53,542,149	52,346,207
Time deposits	9,028,018	10,131,846
Deposits at Cayman Islands office	192,763	201,927
Total deposits	97,042,521	95,493,876
Federal funds purchased and agreements to repurchase securities	185,102	163,442
Accrued interest and other liabilities	1,694,905	1,811,431
Long-term borrowings	8,087,619	9,493,835
Total liabilities	107,010,147	106,962,584
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 March 31, 2017 and December 31, 2016; Liquidation preference of $10,000 per share: 50,000 shares at March 31, 2017 and December 31, 2016	1,231,500	1,231,500
Common stock, $.50 par, 250,000,000 shares authorized, 159,825,445 shares issued at March 31, 2017; 159,945,678 shares issued at December 31, 2016	79,913	79,973
Common stock issuable, 28,740 shares at March 31, 2017; 32,403 shares at December 31, 2016	1,921	2,145
Additional paid-in capital	6,603,355	6,676,948
Retained earnings	9,437,450	9,222,488
Accumulated other comprehensive income (loss), net	(291,567)	(294,636)
Treasury stock - common, at cost - 6,073,095 shares at March 31, 2017; 3,764,742 shares at December 31, 2016	(849,468)	(431,796)
Total shareholders’ equity	16,213,104	16,486,622
Total liabilities and shareholders’ equity	$ 123,223,251	$ 123,449,206