Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
ASSETS
Loans	$ 16,497,385	$ 16,103,651
Allowance for credit losses on loans	(202,814)	(215,973)
Net loans	16,294,571	15,887,678
Loans held for sale	10,275	6,708
Securities:
Available for sale (amortized cost of $9,552,397 and $8,887,734, respectively)	9,753,392	9,299,688
Held to maturity, net of allowance for credit losses of $2,959 and $2,610, respectively (fair value of $1,012,129 and $1,029,444, respectively)	1,039,711	1,012,004
Trading securities	29,099	35,020
Other securities	298,209	296,053
Total securities	11,120,411	10,642,765
Federal funds sold and securities purchased under agreements to resell	1,629,813	1,650,335
Interest-bearing due from banks	3,860,763	3,110,042
Cash and due from banks	387,230	430,638
Premises and equipment, net	286,068	293,095
Accrued income	131,533	139,892
Goodwill	174,518	180,867
Other intangibles, net	17,793	21,056
Other assets	756,414	764,428
Total assets	34,669,389	33,127,504
Deposits:
Noninterest-bearing demand	11,604,415	9,879,970
Interest-bearing demand and savings	16,011,812	16,295,186
Time deposits under $250,000	457,290	477,748
Time deposits of $250,000 or more	207,275	398,347
Total deposits	28,280,792	27,051,251
Federal funds purchased and repurchase agreements	2,759,818	2,315,497
Long-term debt	270,074	269,595
Accrued expenses and taxes	239,001	319,676
Other liabilities	161,465	154,537
Total liabilities	31,711,150	30,110,556
SHAREHOLDERS' EQUITY
Common stock, $1.00 par value; 80,000,000 shares authorized; 55,056,730 shares issued, 48,302,634 and 48,006,386 shares outstanding, respectively	55,057	55,057
Capital surplus	1,093,667	1,090,450
Retained earnings	1,968,318	1,891,246
Accumulated other comprehensive income, net	169,197	318,340
Treasury stock, 6,754,096 and 7,050,344 shares, at cost, respectively	(328,000)	(338,145)
Total shareholders' equity	2,958,239	3,016,948
Total liabilities and shareholders' equity	$ 34,669,389	$ 33,127,504