Loans and Allowance for Credit Losses - Financing Receivables Past Due (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	$ 37,105,164	$ 35,485,776
Commercial real estate - owner occupied
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	4,744,806	4,388,531
Commercial real estate - non-owner occupied
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	8,285,390	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	3,412,060	3,699,321
Commercial and industrial
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	14,905,306	13,815,817
Consumer and other
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	593,841	537,507
Residential Mortgage
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	5,163,761	4,914,482
30-59 days past due
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	27,308	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	3,270	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	1,368	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	14,166	15,992
30-59 days past due \| Consumer and other
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	2,329	2,592
30-59 days past due \| Residential Mortgage
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	6,175	19,986
60-89 days past due
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	29,666	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	609	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	0	0
60-89 days past due \| Construction and land development
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	345	0
60-89 days past due \| Commercial and industrial
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	8,189	8,515
60-89 days past due \| Consumer and other
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,524	1,500
60-89 days past due \| Residential Mortgage
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	18,999	1,621
90 days or more past due
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	86,669	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	11,821	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	29,765	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	1,691	1,541
90 days or more past due \| Commercial and industrial
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	25,470	31,077
90 days or more past due \| Consumer and other
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,226	1,160
90 days or more past due \| Residential Mortgage
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	16,696	20,615
Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	143,643	166,082
Financial Asset, Past Due \| Commercial real estate - owner occupied
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	15,700	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	31,133	40,686
Financial Asset, Past Due \| Construction and land development
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	2,036	1,666
Financial Asset, Past Due \| Commercial and industrial
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	47,825	55,584
Financial Asset, Past Due \| Consumer and other
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	5,079	5,252
Financial Asset, Past Due \| Residential Mortgage
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	41,870	42,222
Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	36,961,521	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	4,729,106	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	8,254,257	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	3,410,024	3,697,655
Financial Asset, Not Past Due \| Commercial and industrial
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	14,857,481	13,760,233
Financial Asset, Not Past Due \| Consumer and other
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	588,762	532,255
Financial Asset, Not Past Due \| Residential Mortgage
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	$ 5,121,891	$ 4,872,260