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Loans - Summary of loans (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Summary of Loans
Total loans	$ 32,667,310	$ 32,388,489
Less allowance for credit losses	(469,654)	(456,573)	$ (370,645)	$ (356,444)
Loans, net	32,197,656	31,931,916
Deferred costs	73,500	68,000
Unamortized Discounts	47,000	51,300
Accrued interest receivable (AIR)	$ 131,000	$ 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	$ 2,437,343	$ 2,923,514
Commercial non-owner occupied
Summary of Loans
Total loans	9,112,474	8,571,634
Consumer Owner Occupied Loans
Summary of Loans
Total loans	6,814,472	6,595,005
Home equity loans
Summary of Loans
Total loans	1,408,594	1,398,445
Commercial owner occupied real estate loan
Summary of Loans
Total loans	5,511,855	5,497,671
Commercial and industrial
Summary of Loans
Total loans	5,544,131	5,504,539
Other income producing property
Summary of Loans
Total loans	640,055	656,334
Consumer loans
Summary of Loans
Total loans	1,196,895	1,233,650
Other loans
Summary of Loans
Total loans	1,491	7,697
Commercial loans
Summary of Loans
Total loans	22,572,694	22,391,162
Commercial loans | Construction and land development
Summary of Loans
Total loans	1,813,458	2,207,965
Commercial loans | Commercial non-owner occupied
Summary of Loans
Total loans	9,112,474	8,571,634
Commercial loans | Consumer Owner Occupied Loans
Summary of Loans
Total loans	59,013	57,443
Commercial loans | Commercial owner occupied real estate loan
Summary of Loans
Total loans	5,511,855	5,497,671
Commercial loans | Commercial and industrial
Summary of Loans
Total loans	5,544,131	5,504,539
Commercial loans | Other income producing property
Summary of Loans
Total loans	530,272	544,213
Commercial loans | Other loans
Summary of Loans
Total loans	1,491	7,697
Consumer portfolio loans
Summary of Loans
Total loans	10,094,616	9,997,327
Consumer portfolio loans | Construction and land development
Summary of Loans
Total loans	623,885	715,549
Consumer portfolio loans | Consumer Owner Occupied Loans
Summary of Loans
Total loans	6,755,459	6,537,562
Consumer portfolio loans | Home equity loans
Summary of Loans
Total loans	1,408,594	1,398,445
Consumer portfolio loans | Other income producing property
Summary of Loans
Total loans	109,783	112,121
Consumer portfolio loans | Consumer loans
Summary of Loans
Total loans	$ 1,196,895	$ 1,233,650

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