Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Interest income:
Loans, including fees	$ 341,456	$ 207,163	$ 656,057	$ 399,913
Loans held for sale	365	443	660	1,134
Securities-taxable	47,501	39,015	95,147	76,179
Securities-tax exempt	4,728	4,718	9,449	9,373
Short-term investments	11,223	3,525	16,563	5,051
Total interest income	405,273	254,864	777,876	491,650
Interest expense:
Deposits	102,535	5,051	166,986	8,829
Short-term borrowings	25,733	959	45,796	2,378
Long-term debt	3,094	3,122	6,189	6,248
Total interest expense	131,362	9,132	218,971	17,455
Net interest income	273,911	245,732	558,905	474,195
Provision for credit losses	7,633	(9,761)	13,653	(32,288)
Net interest income after provision for credit losses	266,278	255,493	545,252	506,483
Noninterest income:
Securities transactions, net				(87)
Other income	12,819	14,988	24,037	29,985
Total noninterest income	83,225	85,653	163,555	169,085
Noninterest expense:
Compensation expense	94,121	94,155	186,524	180,148
Employee benefits	20,743	21,015	43,663	42,418
Personnel expense	114,864	115,170	230,187	222,566
Net occupancy expense	12,707	12,225	24,913	23,905
Equipment expense	5,043	4,703	9,779	9,570
Data processing expense	29,562	26,169	57,744	50,408
Professional services expense	8,915	8,423	18,046	16,216
Amortization of intangible assets	2,957	3,586	6,071	7,334
Deposit insurance and regulatory fees	6,463	3,503	12,383	7,243
Other real estate and foreclosed assets expense (income), net	(282)	(88)	(127)	(1,852)
Other expense	21,909	13,406	44,026	31,646
Total noninterest expense	202,138	187,097	403,022	367,036
Income before income taxes	147,365	154,049	305,785	308,532
Income taxes expense	29,571	32,614	61,524	63,619
Net income	$ 117,794	$ 121,435	$ 244,261	$ 244,913
Earnings per common share-basic	$ 1.35	$ 1.39	$ 2.81	$ 2.79
Earnings per common share-diluted	1.35	1.38	2.80	2.78
Dividends paid per share	$ 0.30	$ 0.27	$ 0.60	$ 0.54
Weighted average shares outstanding-basic	86,096	86,067	86,057	86,362
Weighted average shares outstanding-diluted	86,370	86,354	86,350	86,654
Service charges on deposit accounts
Noninterest income:
Service charges on deposit accounts	$ 21,491	$ 20,495	$ 42,113	$ 42,169
Trust fees
Noninterest income:
Service charges on deposit accounts	17,393	17,309	34,127	32,588
Bank card and ATM fees
Noninterest income:
Service charges on deposit accounts	20,982	21,870	41,703	42,266
Investment and annuity fees and insurance commissions
Noninterest income:
Service charges on deposit accounts	8,241	8,001	17,108	15,428
Secondary mortgage market operations
Noninterest income:
Service charges on deposit accounts	$ 2,299	$ 2,990	$ 4,467	$ 6,736