Consolidated Balance Sheet - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Assets
Cash and due from banks	$ 1,552,743	$ 1,432,805
Interest-bearing deposits at banks	23,663,810	7,190,154
Federal funds sold		3,500
Trading account	1,068,581	470,129
Investment securities (includes pledged securities that can be sold or repledged of $105,136 at December 31, 2020; $200,339 at December 31, 2019)
Available for sale (cost: $4,621,027 at December 31, 2020; $6,258,276 at December 31, 2019)	4,822,606	6,318,776
Held to maturity (fair value: $1,842,281 at December 31, 2020; $2,699,206 at December 31, 2019)	1,748,989	2,656,917
Equity and other securities (cost: $449,008 at December 31, 2020; $487,041 at December 31, 2019)	474,102	521,558
Total investment securities	7,045,697	9,497,251
Loans and leases	98,875,788	91,188,525
Unearned discount	(339,921)	(265,656)
Loans and leases, net of unearned discount	98,535,867	90,922,869
Allowance for credit losses	(1,736,387)	(1,051,071)
Loans and leases, net	96,799,480	89,871,798
Premises and equipment	1,161,558	1,140,924
Goodwill	4,593,112	4,593,112
Core deposit and other intangible assets	14,165	29,034
Accrued interest and other assets	6,701,959	5,644,050
Total assets	142,601,105	119,872,757
Liabilities
Noninterest-bearing deposits	47,572,884	32,396,407
Savings and interest-checking deposits	67,680,840	54,932,162
Time deposits	3,899,910	5,757,456
Deposits at Cayman Islands office	652,104	1,684,044
Total deposits	119,805,738	94,770,069
Short-term borrowings	59,482	62,363
Accrued interest and other liabilities	2,166,409	2,337,490
Long-term borrowings	4,382,193	6,986,186
Total liabilities	126,413,822	104,156,108
Shareholders' equity
Preferred stock, $1.00 par, 1,000,000 shares authorized; Issued and outstanding: Liquidation preference of $1,000 per share: 350,000 shares at December 31, 2020 and December 31, 2019; Liquidation preference of $10,000 per share: 90,000 shares at December 31, 2020 and December 31, 2019	1,250,000	1,250,000
Common stock, $.50 par, 250,000,000 shares authorized, 159,741,898 shares issued at December 31, 2020 and December 31, 2019	79,871	79,871
Common stock issuable, 18,113 shares at December 31, 2020; 21,534 shares at December 31, 2019	1,344	1,566
Additional paid-in capital	6,617,404	6,593,539
Retained earnings	13,444,428	12,820,916
Accumulated other comprehensive income (loss), net	(63,032)	(206,680)
Treasury stock — common, at cost — 31,426,742 shares at December 31, 2020; 29,174,402 shares at December 31, 2019	(5,142,732)	(4,822,563)
Total shareholders’ equity	16,187,283	15,716,649
Total liabilities and shareholders’ equity	$ 142,601,105	$ 119,872,757