Consolidated Balance Sheet (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Assets
Cash and due from banks	$ 1,258,989	$ 1,552,743
Interest-bearing deposits at banks	31,407,227	23,663,810
Federal funds sold	1,000
Trading account	687,359	1,068,581
Investment securities (includes pledged securities that can be sold or repledged of $89,522 at March 31, 2021; $105,136 at December 31, 2020)
Available for sale (cost: $4,194,886 at March 31, 2021; $4,621,027 at December 31, 2020	4,364,437	4,822,606
Held to maturity (fair value: $1,850,210 at March 31, 2021; $1,842,281 at December 31, 2020)	1,778,135	1,748,989
Equity and other securities (cost: $455,286 at March 31, 2021; $449,008 at December 31, 2020)	468,095	474,102
Total investment securities	6,610,667	7,045,697
Loans and leases	99,691,141	98,875,788
Unearned discount	(392,061)	(339,921)
Loans and leases, net of unearned discount	99,299,080	98,535,867
Allowance for credit losses	(1,636,206)	(1,736,387)
Loans and leases, net	97,662,874	96,799,480
Premises and equipment	1,148,941	1,161,558
Goodwill	4,593,112	4,593,112
Core deposit and other intangible assets	11,427	14,165
Accrued interest and other assets	7,099,464	6,701,959
Total assets	150,481,060	142,601,105
Liabilities
Noninterest-bearing deposits	53,641,419	47,572,884
Savings and interest-checking deposits	70,679,036	67,680,840
Time deposits	3,514,219	3,899,910
Deposits at Cayman Islands office	641,691	652,104
Total deposits	128,476,365	119,805,738
Short-term borrowings	58,957	59,482
Accrued interest and other liabilities	2,000,727	2,166,409
Long-term borrowings	3,498,503	4,382,193
Total liabilities	134,034,552	126,413,822
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 March 31, 2021 and December 31, 2020; Liquidation preference of $10,000 per share: 90,000 shares at March 31, 2021 and December 31, 2020	1,250,000	1,250,000
Common stock, $.50 par, 250,000,000 shares authorized, 159,741,898 shares issued at March 31, 2021 and December 31, 2020	79,871	79,871
Common stock issuable, 15,492 shares at March 31, 2021; 18,113 shares at December 31, 2020	1,165	1,344
Additional paid-in capital	6,611,150	6,617,404
Retained earnings	13,731,893	13,444,428
Accumulated other comprehensive income (loss), net	(138,478)	(63,032)
Treasury stock — common, at cost — 31,098,951 shares at March 31, 2021; 31,426,742 shares at December 31, 2020	(5,089,093)	(5,142,732)
Total shareholders’ equity	16,446,508	16,187,283
Total liabilities and shareholders’ equity	$ 150,481,060	$ 142,601,105