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Loans and Allowance for Credit Losses - Financing Receivables Past Due (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	$ 36,136,746	$ 35,485,776
Commercial real estate - owner occupied
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	4,594,376	4,388,531
Commercial real estate - non-owner occupied
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	8,338,098	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	3,525,860	3,699,321
Commercial and industrial
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	14,131,312	13,815,817
Consumer and other
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	569,742	537,507
Residential Mortgage
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	4,977,358	4,914,482
30-59 days past due
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	38,796	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	3,385	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	86	1,217
30-59 days past due | Construction and land development
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	125
30-59 days past due | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	18,099	15,992
30-59 days past due | Consumer and other
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	3,335	2,592
30-59 days past due | Residential Mortgage
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	13,891	19,986
60-89 days past due
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	16,467	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	1,011	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	86	0
60-89 days past due | Construction and land development
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	249	0
60-89 days past due | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	8,220	8,515
60-89 days past due | Consumer and other
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	2,324	1,500
60-89 days past due | Residential Mortgage
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	4,577	1,621
90 days or more past due
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	96,261	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	13,455	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	30,669	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	1,747	1,541
90 days or more past due | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	33,066	31,077
90 days or more past due | Consumer and other
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,417	1,160
90 days or more past due | Residential Mortgage
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	15,907	20,615
Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	151,524	166,082
Financial Asset, Past Due | Commercial real estate - owner occupied
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	17,851	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	30,841	40,686
Financial Asset, Past Due | Construction and land development
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,996	1,666
Financial Asset, Past Due | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	59,385	55,584
Financial Asset, Past Due | Consumer and other
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	7,076	5,252
Financial Asset, Past Due | Residential Mortgage
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	34,375	42,222
Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	35,985,222	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	4,576,525	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	8,307,257	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	3,523,864	3,697,655
Financial Asset, Not Past Due | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	14,071,927	13,760,233
Financial Asset, Not Past Due | Consumer and other
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	562,666	532,255
Financial Asset, Not Past Due | Residential Mortgage
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	$ 4,942,983	$ 4,872,260

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