Loans and Allowance for Credit Losses - Financing Receivables Past Due (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	$ 37,932,613	$ 35,485,776
Commercial real estate - owner occupied
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	4,904,462	4,388,531
Commercial real estate - non-owner occupied
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	8,088,289	8,130,118
Consumer real estate – mortgage
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss		4,914,482
Construction and land development
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	3,389,451	3,699,321
Commercial and industrial
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	15,570,921	13,815,817
Consumer and other
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	606,380	537,507
Residential Mortgage
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	5,373,110	4,914,482
30-59 days past due
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	34,197	47,769
30-59 days past due \| Commercial real estate - owner occupied
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	2,983	7,857
30-59 days past due \| Commercial real estate - non-owner occupied
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	179	1,217
30-59 days past due \| Construction and land development
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	293	125
30-59 days past due \| Commercial and industrial
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	19,693	15,992
30-59 days past due \| Consumer and other
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	2,689	2,592
30-59 days past due \| Residential Mortgage
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	8,360	19,986
60-89 days past due
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	32,139	14,362
60-89 days past due \| Commercial real estate - owner occupied
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,448	2,726
60-89 days past due \| Commercial real estate - non-owner occupied
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,591	0
60-89 days past due \| Construction and land development
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	247	0
60-89 days past due \| Commercial and industrial
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	12,336	8,515
60-89 days past due \| Consumer and other
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,613	1,500
60-89 days past due \| Residential Mortgage
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	14,904	1,621
90 days or more past due
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	87,614	103,951
90 days or more past due \| Commercial real estate - owner occupied
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	10,378	10,089
90 days or more past due \| Commercial real estate - non-owner occupied
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	29,086	39,469
90 days or more past due \| Construction and land development
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	2,037	1,541
90 days or more past due \| Commercial and industrial
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	26,312	31,077
90 days or more past due \| Consumer and other
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,077	1,160
90 days or more past due \| Residential Mortgage
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	18,724	20,615
Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	153,950	166,082
Financial Asset, Past Due \| Commercial real estate - owner occupied
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	14,809	20,672
Financial Asset, Past Due \| Commercial real estate - non-owner occupied
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	30,856	40,686
Financial Asset, Past Due \| Construction and land development
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	2,577	1,666
Financial Asset, Past Due \| Commercial and industrial
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	58,341	55,584
Financial Asset, Past Due \| Consumer and other
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	5,379	5,252
Financial Asset, Past Due \| Residential Mortgage
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	41,988	42,222
Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	37,778,663	35,319,694
Financial Asset, Not Past Due \| Commercial real estate - owner occupied
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	4,889,653	4,367,859
Financial Asset, Not Past Due \| Commercial real estate - non-owner occupied
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	8,057,433	8,089,432
Financial Asset, Not Past Due \| Construction and land development
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	3,386,874	3,697,655
Financial Asset, Not Past Due \| Commercial and industrial
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	15,512,580	13,760,233
Financial Asset, Not Past Due \| Consumer and other
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	601,001	532,255
Financial Asset, Not Past Due \| Residential Mortgage
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	$ 5,331,122	$ 4,872,260