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Loans and Allowance for Credit Losses (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	$ 36,136,746	$ 35,485,776
Financing Receivable, Allowance for Credit Loss	(417,462)	(414,494)	$ (371,337)	$ (353,055)
Financing Receivable, after Allowance for Credit Loss	35,719,284	35,071,282
Commercial real estate - owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	4,594,376	4,388,531
Financing Receivable, Allowance for Credit Loss	(39,102)	(36,997)	(29,690)	(28,690)
Commercial real estate - non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	8,338,098	8,130,118
Financing Receivable, Allowance for Credit Loss	(69,826)	(80,654)	(72,581)	(57,687)
Consumer real estate – mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss		4,914,482
Financing Receivable, Allowance for Credit Loss	(86,447)	(80,042)	(75,814)	(71,354)
Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	3,525,860	3,699,321
Financing Receivable, Allowance for Credit Loss	(30,461)	(33,620)	(33,734)	(39,142)
Commercial and Industrial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	14,131,312	13,815,817
Financing Receivable, Allowance for Credit Loss	(183,205)	(174,799)	(151,172)	(148,212)
Consumer and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	569,742	537,507
Financing Receivable, Allowance for Credit Loss	(8,421)	(8,382)	$ (8,346)	$ (7,970)
Residential Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	$ 4,977,358	$ 4,914,482

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