Consolidated Statements of Income (unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Interest income:
Loans, including fees	$ 463,688	$ 393,366
Investment securities:
Taxable	39,745	41,565
Tax-exempt	5,568	6,557
Federal funds sold, securities purchased under agreements to resell and interest-bearing deposits with banks	8,254	8,921
Total interest income	517,255	450,409
Interest expense:
Deposits	160,162	55,942
Federal funds purchased and securities sold under agreements to repurchase	4,727	2,853
Corporate and subordinated debentures	6,009	5,735
Other borrowings	2,421	4,616
Total interest expense	173,319	69,146
Net interest income	343,936	381,263
Provision for credit losses	12,686	33,091
Net interest income after provision for credit losses	331,250	348,172
Noninterest income:
Securities gains, net		45
Other income	13,179	9,866
Total noninterest income	71,558	71,355
Noninterest expense:
Salaries and employee benefits	150,453	144,060
Occupancy expense	22,577	21,533
Information services expense	22,353	19,925
OREO and loan related expense	606	169
Amortization of intangibles	5,998	7,299
Supplies, printing and postage expense	2,540	2,640
Professional fees	3,115	3,702
FDIC assessment and other regulatory charges	8,534	6,294
FDIC special assessment	3,854
Advertising and marketing	1,984	2,118
Merger, branch consolidation, severance related and other expense	4,513	9,412
Other expense	22,763	23,353
Total noninterest expense	249,290	240,505
Earnings:
Income before provision for income taxes	153,518	179,022
Provision for income taxes	38,462	39,096
Net income	$ 115,056	$ 139,926
Earnings per common share:
Basic (in dollars per share)	$ 1.51	$ 1.84
Diluted (in dollars per share)	$ 1.50	$ 1.83
Weighted average common shares outstanding:
Basic (in shares)	76,301	75,902
Diluted (in shares)	76,660	76,389
Fees on deposit accounts
Noninterest income:
Noninterest income	$ 33,145	$ 29,859
Mortgage banking income
Noninterest income:
Noninterest income	6,169	4,332
Trust and investment services income
Noninterest income:
Noninterest income	10,391	9,937
Correspondent banking and capital markets income
Noninterest income:
Noninterest income	4,311	13,594
SBA income
Noninterest income:
Noninterest income	$ 4,363	$ 3,722