Loans - Summary of Aging of Recorded Investment in Past Due Portfolio Loans by Portfolio Class and Category (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Financing Receivable, Past Due [Line Items]
Total	$ 11,028,492	$ 10,884,118
Loans, including unearned loan fees	112,317	77,569
Non-Covered Loans
Financing Receivable, Past Due [Line Items]
Total	11,032,537	10,888,345
Loans, including unearned loan fees	11,028,492	10,884,118
Unearned loan fees, net	(4,045)	(4,227)
Loans, before unearned loan fees, after allowance	11,032,537	10,888,345
Non-Covered Loans | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total	4,768,777	4,674,056
Loans, including unearned loan fees	4,768,777	4,674,056
Non-Covered Loans | CRE - investor owned
Financing Receivable, Past Due [Line Items]
Total	2,448,674	2,452,402
Loans, including unearned loan fees	2,448,674	2,452,402
Non-Covered Loans | CRE - owner occupied
Financing Receivable, Past Due [Line Items]
Total	2,349,292	2,344,117
Loans, including unearned loan fees	2,349,292	2,344,117
Non-Covered Loans | Construction and land development
Financing Receivable, Past Due [Line Items]
Total	820,249	760,122
Loans, including unearned loan fees	820,249	760,122
Non-Covered Loans | Residential real estate
Financing Receivable, Past Due [Line Items]
Total	366,934	371,995
Loans, including unearned loan fees	366,934	371,995
Non-Covered Loans | Other
Financing Receivable, Past Due [Line Items]
Total	278,611	285,653
Loans, including unearned loan fees	278,611	285,653
Total Past Due | Non-Covered Loans
Financing Receivable, Past Due [Line Items]
Loans, before unearned loan fees	78,478	60,676
Total Past Due | Non-Covered Loans | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total	25,127	12,482
Total Past Due | Non-Covered Loans | CRE - investor owned
Financing Receivable, Past Due [Line Items]
Total	20,052	20,300
Total Past Due | Non-Covered Loans | CRE - owner occupied
Financing Receivable, Past Due [Line Items]
Total	29,492	22,551
Total Past Due | Non-Covered Loans | Construction and land development
Financing Receivable, Past Due [Line Items]
Total	2,648	2,678
Total Past Due | Non-Covered Loans | Residential real estate
Financing Receivable, Past Due [Line Items]
Total	1,112	2,579
Total Past Due | Non-Covered Loans | Other
Financing Receivable, Past Due [Line Items]
Total	47	86
30-89 Days Past Due | Non-Covered Loans
Financing Receivable, Past Due [Line Items]
Loans, before unearned loan fees	39,603	16,231
30-89 Days Past Due | Non-Covered Loans | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total	20,996	3,445
30-89 Days Past Due | Non-Covered Loans | CRE - investor owned
Financing Receivable, Past Due [Line Items]
Total	1,657	1,905
30-89 Days Past Due | Non-Covered Loans | CRE - owner occupied
Financing Receivable, Past Due [Line Items]
Total	14,844	8,409
30-89 Days Past Due | Non-Covered Loans | Construction and land development
Financing Receivable, Past Due [Line Items]
Total	973	770
30-89 Days Past Due | Non-Covered Loans | Residential real estate
Financing Receivable, Past Due [Line Items]
Total	1,112	1,620
30-89 Days Past Due | Non-Covered Loans | Other
Financing Receivable, Past Due [Line Items]
Total	21	82
90 or More Days Past Due | Non-Covered Loans
Financing Receivable, Past Due [Line Items]
Loans, before unearned loan fees	38,875	44,445
90 or More Days Past Due | Non-Covered Loans | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total	4,131	9,037
90 or More Days Past Due | Non-Covered Loans | CRE - investor owned
Financing Receivable, Past Due [Line Items]
Total	18,395	18,395
90 or More Days Past Due | Non-Covered Loans | CRE - owner occupied
Financing Receivable, Past Due [Line Items]
Total	14,648	14,142
90 or More Days Past Due | Non-Covered Loans | Construction and land development
Financing Receivable, Past Due [Line Items]
Total	1,675	1,908
90 or More Days Past Due | Non-Covered Loans | Residential real estate
Financing Receivable, Past Due [Line Items]
Total	0	959
90 or More Days Past Due | Non-Covered Loans | Other
Financing Receivable, Past Due [Line Items]
Total	26	4
Current | Non-Covered Loans
Financing Receivable, Past Due [Line Items]
Loans, before unearned loan fees	10,954,059	10,827,669
Current | Non-Covered Loans | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total	4,743,650	4,661,574
Current | Non-Covered Loans | CRE - investor owned
Financing Receivable, Past Due [Line Items]
Total	2,428,622	2,432,102
Current | Non-Covered Loans | CRE - owner occupied
Financing Receivable, Past Due [Line Items]
Total	2,319,800	2,321,566
Current | Non-Covered Loans | Construction and land development
Financing Receivable, Past Due [Line Items]
Total	817,601	757,444
Current | Non-Covered Loans | Residential real estate
Financing Receivable, Past Due [Line Items]
Total	365,822	369,416
Current | Non-Covered Loans | Other
Financing Receivable, Past Due [Line Items]
Total	$ 278,564	$ 285,567