Loans - Summary of loans (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
Summary of Loans
Total loans	$ 33,234,564		$ 32,388,489
Less allowance for credit losses	(472,298)	$ (469,654)	(456,573)	$ (427,392)	$ (370,645)	$ (356,444)
Loans, net	32,762,266		31,931,916
Deferred costs	77,800		68,000
Unamortized Discounts	42,700		51,300
Accrued interest receivable (AIR)	$ 132,700		$ 127,000
Financing Receivable, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]	Other Assets.		Other Assets.
Construction and land development
Summary of Loans
Total loans	$ 2,592,307		$ 2,923,514
Consumer Owner-Occupied Loans
Summary of Loans
Total loans	6,969,340		6,595,005
Home equity loans
Summary of Loans
Total loans	1,471,384		1,398,445
Commercial and industrial
Summary of Loans
Total loans	5,769,838		5,504,539
Other income producing property
Summary of Loans
Total loans	624,957		656,334
Consumer loans
Summary of Loans
Total loans	1,175,135		1,233,650
Other loans
Summary of Loans
Total loans	1,809		7,697
Commercial loans
Summary of Loans
Total loans	23,032,301		22,391,162
Commercial loans | Construction and land development
Summary of Loans
Total loans	2,048,073		2,207,965
Commercial loans | Commercial non-owner occupied
Summary of Loans
Total loans	9,106,816		8,571,634
Commercial loans | Commercial non-owner occupied real estate
Summary of Loans
Total loans	5,522,978		5,497,671
Commercial loans | Consumer Owner-Occupied Loans
Summary of Loans
Total loans	64,179		57,443
Commercial loans | Commercial and industrial
Summary of Loans
Total loans	5,769,838		5,504,539
Commercial loans | Other income producing property
Summary of Loans
Total loans	518,608		544,213
Commercial loans | Other loans
Summary of Loans
Total loans	1,809		7,697
Consumer loans
Summary of Loans
Total loans	10,202,263		9,997,327
Consumer loans | Construction and land development
Summary of Loans
Total loans	544,234		715,549
Consumer loans | Consumer Owner-Occupied Loans
Summary of Loans
Total loans	6,905,161		6,537,562
Consumer loans | Home equity loans
Summary of Loans
Total loans	1,471,384		1,398,445
Consumer loans | Other income producing property
Summary of Loans
Total loans	106,349		112,121
Consumer loans | Consumer loans
Summary of Loans
Total loans	$ 1,175,135		$ 1,233,650