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Loans and Allowance for Credit Losses (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Jun. 30, 2025	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	$ 37,932,613		$ 35,485,776
Financing Receivable, Allowance for Credit Loss	(434,450)	$ (422,125)	(414,494)	$ (391,534)	$ (381,601)	$ (353,055)
Financing Receivable, after Allowance for Credit Loss	37,498,163		35,071,282
Commercial real estate - owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	4,904,462		4,388,531
Financing Receivable, Allowance for Credit Loss	(40,190)	(37,070)	(36,997)	(31,700)	(29,847)	(28,690)
Commercial real estate - non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	8,088,289		8,130,118
Financing Receivable, Allowance for Credit Loss	(68,515)	(69,661)	(80,654)	(80,763)	(78,964)	(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	(88,056)	(87,296)	(80,042)	(76,187)	(80,247)	(71,354)
Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	3,389,451		3,699,321
Financing Receivable, Allowance for Credit Loss	(35,096)	(32,753)	(33,620)	(32,375)	(30,035)	(39,142)
Commercial and Industrial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	15,570,921		13,815,817
Financing Receivable, Allowance for Credit Loss	(192,454)	(187,020)	(174,799)	(162,371)	(154,014)	(148,212)
Consumer and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	606,380		537,507
Financing Receivable, Allowance for Credit Loss	(10,139)	$ (8,325)	(8,382)	$ (8,138)	$ (8,494)	$ (7,970)
Residential Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	$ 5,373,110		$ 4,914,482

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