Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Interest income:
Loans, including fees	$ 207,163	$ 209,066	$ 399,913	$ 422,779
Loans held for sale	443	648	1,134	1,319
Securities-taxable	39,015	33,148	76,179	64,351
Securities-tax exempt	4,718	4,762	9,373	9,545
Short-term investments	3,525	676	5,051	1,091
Total interest income	254,864	248,300	491,650	499,085
Interest expense:
Deposits	5,051	7,064	8,829	16,291
Short-term borrowings	959	1,555	2,378	3,088
Long-term debt	3,122	5,038	6,248	10,476
Total interest expense	9,132	13,657	17,455	29,855
Net interest income	245,732	234,643	474,195	469,230
Provision for credit losses	(9,761)	(17,229)	(32,288)	(22,140)
Net interest income after provision for credit losses	255,493	251,872	506,483	491,370
Noninterest income:
Securities transactions, net		333	(87)	333
Other income	14,988	17,881	29,985	33,533
Total noninterest income	85,653	94,272	169,085	181,361
Noninterest expense:
Compensation expense	94,155	100,587	180,148	196,433
Employee benefits	21,015	42,067	42,418	65,836
Personnel expense	115,170	142,654	222,566	262,269
Net occupancy expense	12,225	12,955	23,905	25,865
Equipment expense	4,703	4,392	9,570	9,173
Data processing expense	26,169	23,885	50,408	46,832
Professional services expense	8,423	13,473	16,216	24,724
Amortization of intangible assets	3,586	4,245	7,334	8,664
Deposit insurance and regulatory fees	3,503	2,967	7,243	6,362
Other real estate and foreclosed assets income, net	(88)	(86)	(1,852)	(80)
Other expense	13,406	32,285	31,646	46,033
Total noninterest expense	187,097	236,770	367,036	429,842
Income before income taxes	154,049	109,374	308,532	242,889
Income taxes expense	32,614	20,656	63,619	46,999
Net income	$ 121,435	$ 88,718	$ 244,913	$ 195,890
Earnings per common share-basic	$ 1.39	$ 1.00	$ 2.79	$ 2.21
Earnings per common share-diluted	1.38	1.00	2.78	2.20
Dividends paid per share	$ 0.27	$ 0.27	$ 0.54	$ 0.54
Weighted average shares outstanding-basic	86,067	86,814	86,362	86,783
Weighted average shares outstanding-diluted	86,354	86,990	86,654	86,932
Service charges on deposit accounts
Noninterest income:
Service charges on deposit accounts	$ 20,495	$ 19,381	$ 42,169	$ 38,527
Trust fees
Noninterest income:
Service charges on deposit accounts	17,309	16,307	32,588	31,310
Bank card and ATM fees
Noninterest income:
Service charges on deposit accounts	21,870	20,483	42,266	38,603
Investment and annuity fees and insurance commissions
Noninterest income:
Service charges on deposit accounts	8,001	7,331	15,428	14,789
Secondary mortgage market operations
Noninterest income:
Service charges on deposit accounts	$ 2,990	$ 12,556	$ 6,736	$ 24,266