Loans and Allowance for Credit Losses - Financing Receivables Past Due (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Financing Receivable, Past Due [Line Items]
Loans	$ 34,308,310	$ 32,676,091
Commercial real estate - owner occupied
Financing Receivable, Past Due [Line Items]
Loans	4,264,743	4,044,896
Commercial real estate - non-owner occupied
Financing Receivable, Past Due [Line Items]
Loans	8,132,388	7,535,494
Consumer real estate – mortgage
Financing Receivable, Past Due [Line Items]
Loans	4,907,766	4,851,531
Construction and land development
Financing Receivable, Past Due [Line Items]
Loans	3,486,504	4,041,081
Commercial and industrial
Financing Receivable, Past Due [Line Items]
Loans	12,986,865	11,666,691
Consumer and other
Financing Receivable, Past Due [Line Items]
Loans	530,044	536,398
30-59 days past due
Financing Receivable, Past Due [Line Items]
Loans	30,398	83,937
30-59 days past due | Commercial real estate - owner occupied
Financing Receivable, Past Due [Line Items]
Loans	4,052	1,671
30-59 days past due | Commercial real estate - non-owner occupied
Financing Receivable, Past Due [Line Items]
Loans	974	40,577
30-59 days past due | Consumer real estate – mortgage
Financing Receivable, Past Due [Line Items]
Loans	6,844	21,585
30-59 days past due | Construction and land development
Financing Receivable, Past Due [Line Items]
Loans	67	621
30-59 days past due | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Loans	14,581	14,197
30-59 days past due | Consumer and other
Financing Receivable, Past Due [Line Items]
Loans	3,880	5,286
60-89 days past due
Financing Receivable, Past Due [Line Items]
Loans	29,803	32,465
60-89 days past due | Commercial real estate - owner occupied
Financing Receivable, Past Due [Line Items]
Loans	5,931	507
60-89 days past due | Commercial real estate - non-owner occupied
Financing Receivable, Past Due [Line Items]
Loans	0	489
60-89 days past due | Consumer real estate – mortgage
Financing Receivable, Past Due [Line Items]
Loans	14,449	1,352
60-89 days past due | Construction and land development
Financing Receivable, Past Due [Line Items]
Loans	0	28
60-89 days past due | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Loans	7,268	28,221
60-89 days past due | Consumer and other
Financing Receivable, Past Due [Line Items]
Loans	2,155	1,868
90 days or more past due
Financing Receivable, Past Due [Line Items]
Loans	82,005	33,369
90 days or more past due | Commercial real estate - owner occupied
Financing Receivable, Past Due [Line Items]
Loans	3,629	3,398
90 days or more past due | Commercial real estate - non-owner occupied
Financing Receivable, Past Due [Line Items]
Loans	38,413	153
90 days or more past due | Consumer real estate – mortgage
Financing Receivable, Past Due [Line Items]
Loans	17,479	10,824
90 days or more past due | Construction and land development
Financing Receivable, Past Due [Line Items]
Loans	2,696	608
90 days or more past due | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Loans	18,584	16,890
90 days or more past due | Consumer and other
Financing Receivable, Past Due [Line Items]
Loans	1,204	1,496
Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Loans	142,206	149,771
Financial Asset, Past Due | Commercial real estate - owner occupied
Financing Receivable, Past Due [Line Items]
Loans	13,612	5,576
Financial Asset, Past Due | Commercial real estate - non-owner occupied
Financing Receivable, Past Due [Line Items]
Loans	39,387	41,219
Financial Asset, Past Due | Consumer real estate – mortgage
Financing Receivable, Past Due [Line Items]
Loans	38,772	33,761
Financial Asset, Past Due | Construction and land development
Financing Receivable, Past Due [Line Items]
Loans	2,763	1,257
Financial Asset, Past Due | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Loans	40,433	59,308
Financial Asset, Past Due | Consumer and other
Financing Receivable, Past Due [Line Items]
Loans	7,239	8,650
Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Loans	34,166,104	32,526,320
Financial Asset, Not Past Due | Commercial real estate - owner occupied
Financing Receivable, Past Due [Line Items]
Loans	4,251,131	4,039,320
Financial Asset, Not Past Due | Commercial real estate - non-owner occupied
Financing Receivable, Past Due [Line Items]
Loans	8,093,001	7,494,275
Financial Asset, Not Past Due | Consumer real estate – mortgage
Financing Receivable, Past Due [Line Items]
Loans	4,868,994	4,817,770
Financial Asset, Not Past Due | Construction and land development
Financing Receivable, Past Due [Line Items]
Loans	3,483,741	4,039,824
Financial Asset, Not Past Due | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Loans	12,946,432	11,607,383
Financial Asset, Not Past Due | Consumer and other
Financing Receivable, Past Due [Line Items]
Loans	$ 522,805	$ 527,748