Loans - Summary of Aging of Recorded Investment in Past Due Portfolio Loans by Portfolio Class and Category (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Financing Receivable, Past Due [Line Items]
Total	$ 11,079,892	$ 10,884,118
Loans, including unearned loan fees	10,940,114	10,749,347
Non-Covered Loans
Financing Receivable, Past Due [Line Items]
Total	11,081,653	10,888,345
Loans, including unearned loan fees	11,079,892	10,884,118
Unearned loan fees, net	(1,761)	(4,227)
Loans, before unearned loan fees, after allowance	11,081,653	10,888,345
Non-Covered Loans | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total	4,631,613	4,674,056
Loans, including unearned loan fees	4,631,613	4,674,056
Non-Covered Loans | Commercial - investor owned
Financing Receivable, Past Due [Line Items]
Total	2,526,696	2,452,402
Loans, including unearned loan fees	2,526,696	2,452,402
Non-Covered Loans | Commercial - owner occupied
Financing Receivable, Past Due [Line Items]
Total	2,381,636	2,344,117
Loans, including unearned loan fees	2,381,636	2,344,117
Non-Covered Loans | Construction and land development
Financing Receivable, Past Due [Line Items]
Total	896,768	760,122
Loans, including unearned loan fees	896,768	760,122
Non-Covered Loans | Residential
Financing Receivable, Past Due [Line Items]
Total	354,888	371,995
Loans, including unearned loan fees	354,888	371,995
Non-Covered Loans | Other
Financing Receivable, Past Due [Line Items]
Total	290,052	285,653
Loans, including unearned loan fees	290,052	285,653
Total Past Due | Non-Covered Loans
Financing Receivable, Past Due [Line Items]
Loans, before unearned loan fees	59,737	60,676
Total Past Due | Non-Covered Loans | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total	10,714	12,482
Total Past Due | Non-Covered Loans | Commercial - investor owned
Financing Receivable, Past Due [Line Items]
Total	14,557	20,300
Total Past Due | Non-Covered Loans | Commercial - owner occupied
Financing Receivable, Past Due [Line Items]
Total	25,707	22,551
Total Past Due | Non-Covered Loans | Construction and land development
Financing Receivable, Past Due [Line Items]
Total	1,907	2,678
Total Past Due | Non-Covered Loans | Residential
Financing Receivable, Past Due [Line Items]
Total	6,852	2,579
Total Past Due | Non-Covered Loans | Other
Financing Receivable, Past Due [Line Items]
Total	0	86
30-89 Days Past Due | Non-Covered Loans
Financing Receivable, Past Due [Line Items]
Loans, before unearned loan fees	31,439	16,231
30-89 Days Past Due | Non-Covered Loans | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total	8,262	3,445
30-89 Days Past Due | Non-Covered Loans | Commercial - investor owned
Financing Receivable, Past Due [Line Items]
Total	273	1,905
30-89 Days Past Due | Non-Covered Loans | Commercial - owner occupied
Financing Receivable, Past Due [Line Items]
Total	16,310	8,409
30-89 Days Past Due | Non-Covered Loans | Construction and land development
Financing Receivable, Past Due [Line Items]
Total	0	770
30-89 Days Past Due | Non-Covered Loans | Residential
Financing Receivable, Past Due [Line Items]
Total	6,594	1,620
30-89 Days Past Due | Non-Covered Loans | Other
Financing Receivable, Past Due [Line Items]
Total	0	82
90 or More Days Past Due | Non-Covered Loans
Financing Receivable, Past Due [Line Items]
Loans, before unearned loan fees	28,298	44,445
90 or More Days Past Due | Non-Covered Loans | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total	2,452	9,037
90 or More Days Past Due | Non-Covered Loans | Commercial - investor owned
Financing Receivable, Past Due [Line Items]
Total	14,284	18,395
90 or More Days Past Due | Non-Covered Loans | Commercial - owner occupied
Financing Receivable, Past Due [Line Items]
Total	9,397	14,142
90 or More Days Past Due | Non-Covered Loans | Construction and land development
Financing Receivable, Past Due [Line Items]
Total	1,907	1,908
90 or More Days Past Due | Non-Covered Loans | Residential
Financing Receivable, Past Due [Line Items]
Total	258	959
90 or More Days Past Due | Non-Covered Loans | Other
Financing Receivable, Past Due [Line Items]
Total	0	4
Current | Non-Covered Loans
Financing Receivable, Past Due [Line Items]
Loans, before unearned loan fees	11,021,916	10,827,669
Current | Non-Covered Loans | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total	4,620,899	4,661,574
Current | Non-Covered Loans | Commercial - investor owned
Financing Receivable, Past Due [Line Items]
Total	2,512,139	2,432,102
Current | Non-Covered Loans | Commercial - owner occupied
Financing Receivable, Past Due [Line Items]
Total	2,355,929	2,321,566
Current | Non-Covered Loans | Construction and land development
Financing Receivable, Past Due [Line Items]
Total	894,861	757,444
Current | Non-Covered Loans | Residential
Financing Receivable, Past Due [Line Items]
Total	348,036	369,416
Current | Non-Covered Loans | Other
Financing Receivable, Past Due [Line Items]
Total	$ 290,052	$ 285,567