Consolidated Statements of Income (unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Interest income:
Loans, including fees	$ 494,082	$ 443,805	$ 1,436,130	$ 1,256,525
Investment securities:
Taxable	37,900	40,330	116,391	123,149
Tax-exempt	5,734	5,543	17,072	17,687
Federal funds sold, securities purchased under agreements to resell and interest-bearing deposits with banks	6,462	10,831	22,964	31,610
Total interest income	544,178	500,509	1,592,557	1,428,971
Interest expense:
Deposits	177,919	133,944	503,562	290,673
Federal funds purchased and securities sold under agreements to repurchase	5,697	4,291	15,407	10,679
Corporate and subordinated debentures	6,007	6,014	18,014	17,572
Other borrowings	3,075	889	9,899	11,670
Total interest expense	192,698	145,138	546,882	330,594
Net interest income	351,480	355,371	1,045,675	1,098,377
(Recovery) provision for credit losses	(6,971)	32,709	9,604	104,189
Net interest income after (recovery) provision for credit losses	358,451	322,662	1,036,071	994,188
Noninterest income:
Securities gains, net				45
Other income	12,413	12,035	41,157	29,765
Total noninterest income	74,934	72,848	221,717	221,417
Noninterest expense:
Salaries and employee benefits	150,865	146,146	452,753	437,548
Occupancy expense	22,242	22,251	67,272	65,980
Information services expense	23,280	21,428	68,777	62,472
OREO and loan related expense	1,358	613	3,271	768
Amortization of intangibles	5,327	6,616	17,069	20,943
Supplies, printing and postage expense	2,762	2,623	7,828	7,817
Professional fees	4,017	3,456	11,038	11,522
FDIC assessment and other regulatory charges	7,482	8,632	23,787	24,745
FDIC special assessment			4,473
Advertising and marketing	2,296	3,009	6,874	6,648
Merger, branch consolidation, severance related and other expense	3,303	164	13,602	11,384
Other expense	23,915	23,268	68,140	71,510
Total noninterest expense	246,847	238,206	744,884	721,337
Earnings:
Income before provision for income taxes	186,538	157,304	512,904	494,268
Provision for income taxes	43,359	33,160	122,299	106,751
Net income	$ 143,179	$ 124,144	$ 390,605	$ 387,517
Earnings per common share:
Basic (in dollars per share)	$ 1.88	$ 1.63	$ 5.12	$ 5.10
Diluted (in dollars per share)	$ 1.86	$ 1.62	$ 5.09	$ 5.07
Weighted average common shares outstanding:
Basic (in shares)	76,299	76,139	76,284	76,034
Diluted (in shares)	76,805	76,571	76,691	76,446
Fees on deposit accounts
Noninterest income:
Noninterest income	$ 33,986	$ 32,830	$ 100,973	$ 95,790
Mortgage banking income
Noninterest income:
Noninterest income	3,189	2,478	15,270	11,164
Trust and investment services income
Noninterest income:
Noninterest income	11,578	9,556	33,060	29,316
Correspondent banking and capital markets income
Noninterest income:
Noninterest income	9,893	12,916	19,064	45,697
SBA income
Noninterest income:
Noninterest income	$ 3,875	$ 3,033	$ 12,193	$ 9,640