Loans - Summary of Aging of Recorded Investment in Past Due Portfolio Loans by Portfolio Class and Category (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Financing Receivable, Past Due [Line Items]
Total	$ 10,512,623	$ 9,737,138
Loans, including unearned loan fees	88,228	78,789
Non-Covered Loans
Financing Receivable, Past Due [Line Items]
Total	10,518,809	9,744,427
Loans, including unearned loan fees	10,512,623	9,737,138
Unearned loan fees, net	(6,186)	(7,289)
Loans, before unearned loan fees, after allowance	10,518,809	9,744,427
Non-Covered Loans | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total	4,360,862	3,859,964
Loans, including unearned loan fees	4,360,862	3,859,964
Non-Covered Loans | CRE - investor owned
Financing Receivable, Past Due [Line Items]
Total	2,465,654	2,357,820
Loans, including unearned loan fees	2,465,654	2,357,820
Non-Covered Loans | CRE - owner occupied
Financing Receivable, Past Due [Line Items]
Total	2,336,639	2,270,551
Loans, including unearned loan fees	2,336,639	2,270,551
Non-Covered Loans | Construction and land development
Financing Receivable, Past Due [Line Items]
Total	671,573	611,565
Loans, including unearned loan fees	671,573	611,565
Non-Covered Loans | Residential real estate
Financing Receivable, Past Due [Line Items]
Total	368,867	395,537
Loans, including unearned loan fees	368,867	395,537
Non-Covered Loans | Other
Financing Receivable, Past Due [Line Items]
Total	315,214	248,990
Loans, including unearned loan fees	315,214	248,990
Total Past Due | Non-Covered Loans
Financing Receivable, Past Due [Line Items]
Loans, before unearned loan fees	42,395	15,373
Total Past Due | Non-Covered Loans | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total	15,859	2,928
Total Past Due | Non-Covered Loans | CRE - investor owned
Financing Receivable, Past Due [Line Items]
Total	1,711	1,135
Total Past Due | Non-Covered Loans | CRE - owner occupied
Financing Receivable, Past Due [Line Items]
Total	23,554	8,792
Total Past Due | Non-Covered Loans | Construction and land development
Financing Receivable, Past Due [Line Items]
Total	0	1,201
Total Past Due | Non-Covered Loans | Residential real estate
Financing Receivable, Past Due [Line Items]
Total	1,230	1,227
Total Past Due | Non-Covered Loans | Other
Financing Receivable, Past Due [Line Items]
Total	41	90
30-89 Days Past Due | Non-Covered Loans
Financing Receivable, Past Due [Line Items]
Loans, before unearned loan fees	32,160	10,437
30-89 Days Past Due | Non-Covered Loans | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total	12,386	555
30-89 Days Past Due | Non-Covered Loans | CRE - investor owned
Financing Receivable, Past Due [Line Items]
Total	0	0
30-89 Days Past Due | Non-Covered Loans | CRE - owner occupied
Financing Receivable, Past Due [Line Items]
Total	19,476	8,628
30-89 Days Past Due | Non-Covered Loans | Construction and land development
Financing Receivable, Past Due [Line Items]
Total	0	9
30-89 Days Past Due | Non-Covered Loans | Residential real estate
Financing Receivable, Past Due [Line Items]
Total	271	1,227
30-89 Days Past Due | Non-Covered Loans | Other
Financing Receivable, Past Due [Line Items]
Total	27	18
90 or More Days Past Due | Non-Covered Loans
Financing Receivable, Past Due [Line Items]
Loans, before unearned loan fees	10,235	4,936
90 or More Days Past Due | Non-Covered Loans | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total	3,473	2,373
90 or More Days Past Due | Non-Covered Loans | CRE - investor owned
Financing Receivable, Past Due [Line Items]
Total	1,711	1,135
90 or More Days Past Due | Non-Covered Loans | CRE - owner occupied
Financing Receivable, Past Due [Line Items]
Total	4,078	164
90 or More Days Past Due | Non-Covered Loans | Construction and land development
Financing Receivable, Past Due [Line Items]
Total	0	1,192
90 or More Days Past Due | Non-Covered Loans | Residential real estate
Financing Receivable, Past Due [Line Items]
Total	959	0
90 or More Days Past Due | Non-Covered Loans | Other
Financing Receivable, Past Due [Line Items]
Total	14	72
Current | Non-Covered Loans
Financing Receivable, Past Due [Line Items]
Loans, before unearned loan fees	10,476,414	9,729,054
Current | Non-Covered Loans | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total	4,345,003	3,857,036
Current | Non-Covered Loans | CRE - investor owned
Financing Receivable, Past Due [Line Items]
Total	2,463,943	2,356,685
Current | Non-Covered Loans | CRE - owner occupied
Financing Receivable, Past Due [Line Items]
Total	2,313,085	2,261,759
Current | Non-Covered Loans | Construction and land development
Financing Receivable, Past Due [Line Items]
Total	671,573	610,364
Current | Non-Covered Loans | Residential real estate
Financing Receivable, Past Due [Line Items]
Total	367,637	394,310
Current | Non-Covered Loans | Other
Financing Receivable, Past Due [Line Items]
Total	$ 315,173	$ 248,900