Loans - Summary of loans (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Summary of Loans
Total loans	$ 32,388,489	$ 30,177,862
Less allowance for credit losses	(456,573)	(356,444)	$ (301,807)	$ (457,309)
Loans, net	31,931,916	29,821,418
Deferred costs	68,000	49,700
Unamortized Discounts	51,300	72,100
Accrued interest receivable (AIR)	$ 127,000	$ 105,400
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	$ 2,923,514	$ 2,860,360
Commercial non-owner occupied
Summary of Loans
Total loans	8,571,634	8,072,959
Consumer Owner Occupied Loans
Summary of Loans
Total loans	6,595,005	5,162,042
Home equity loans
Summary of Loans
Total loans	1,398,445	1,313,168
Commercial owner occupied real estate loan
Summary of Loans
Total loans	5,497,671	5,460,193
Commercial and industrial
Summary of Loans
Total loans	5,504,539	5,313,483
Other income producing property
Summary of Loans
Total loans	656,334	696,242
Consumer loans
Summary of Loans
Total loans	1,233,650	1,278,426
Other loans
Summary of Loans
Total loans	7,697	20,989
Commercial loans
Summary of Loans
Total loans	22,391,162	21,430,337
Commercial loans | Construction and land development
Summary of Loans
Total loans	2,207,965	1,956,300
Commercial loans | Commercial non-owner occupied
Summary of Loans
Total loans	8,571,634	8,072,959
Commercial loans | Commercial non-owner occupied real estate.
Summary of Loans
Total loans	5,497,671	5,460,193
Commercial loans | Consumer Owner Occupied Loans
Summary of Loans
Total loans	57,443	30,741
Commercial loans | Commercial owner occupied real estate loan
Summary of Loans
Total loans	5,497,671	5,460,193
Commercial loans | Commercial and industrial
Summary of Loans
Total loans	5,504,539	5,313,483
Commercial loans | Other income producing property
Summary of Loans
Total loans	544,213	575,672
Commercial loans | Other loans
Summary of Loans
Total loans	7,697	20,989
Consumer portfolio loans
Summary of Loans
Total loans	9,997,327	8,747,525
Consumer portfolio loans | Construction and land development
Summary of Loans
Total loans	715,549	904,060
Consumer portfolio loans | Consumer Owner Occupied Loans
Summary of Loans
Total loans	6,537,562	5,131,301
Consumer portfolio loans | Home equity loans
Summary of Loans
Total loans	1,398,445	1,313,168
Consumer portfolio loans | Other income producing property
Summary of Loans
Total loans	112,121	120,570
Consumer portfolio loans | Consumer loans
Summary of Loans
Total loans	$ 1,233,650	$ 1,278,426