Loans - Summary of Aging of Recorded Investment in Past Due Portfolio Loans by Portfolio Class and Category (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Financing Receivable, Past Due [Line Items]
Loans, including unearned loan fees	$ 11,583,109	$ 11,220,355
Loans, including unearned loan fees	11,434,255	11,082,405
Non-Covered Loans
Financing Receivable, Past Due [Line Items]
Loans, including unearned loan fees	11,584,296	11,220,818
Loans, including unearned loan fees	11,583,109	11,220,355
Unearned loan fees, net	(1,187)	(463)
Loans, before unearned loan fees, after allowance	11,584,296	11,220,818
Non-Covered Loans | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Loans, including unearned loan fees	4,948,761	4,720,428
Loans, including unearned loan fees	4,948,761	4,720,428
Non-Covered Loans | Commercial - investor owned
Financing Receivable, Past Due [Line Items]
Loans, including unearned loan fees	2,824,200	2,607,755
Loans, including unearned loan fees	2,824,200	2,607,755
Non-Covered Loans | Commercial - owner occupied
Financing Receivable, Past Due [Line Items]
Loans, including unearned loan fees	2,348,111	2,359,956
Loans, including unearned loan fees	2,348,111	2,359,956
Non-Covered Loans | Construction and land development
Financing Receivable, Past Due [Line Items]
Loans, including unearned loan fees	859,827	892,563
Loans, including unearned loan fees	859,827	892,563
Non-Covered Loans | Residential
Financing Receivable, Past Due [Line Items]
Loans, including unearned loan fees	364,516	358,923
Loans, including unearned loan fees	364,516	358,923
Non-Covered Loans | Other
Financing Receivable, Past Due [Line Items]
Loans, including unearned loan fees	238,881	281,193
Loans, including unearned loan fees	238,881	281,193
Total Past Due | Non-Covered Loans
Financing Receivable, Past Due [Line Items]
Loans, before unearned loan fees	159,526	67,874
Total Past Due | Non-Covered Loans | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Loans, including unearned loan fees	30,333	14,176
Total Past Due | Non-Covered Loans | Commercial - investor owned
Financing Receivable, Past Due [Line Items]
Loans, including unearned loan fees	82,283	15,710
Total Past Due | Non-Covered Loans | Commercial - owner occupied
Financing Receivable, Past Due [Line Items]
Loans, including unearned loan fees	33,665	29,133
Total Past Due | Non-Covered Loans | Construction and land development
Financing Receivable, Past Due [Line Items]
Loans, including unearned loan fees	2,459	5,721
Total Past Due | Non-Covered Loans | Residential
Financing Receivable, Past Due [Line Items]
Loans, including unearned loan fees	10,736	3,091
Total Past Due | Non-Covered Loans | Other
Financing Receivable, Past Due [Line Items]
Loans, including unearned loan fees	50	43
30-89 Days Past Due | Non-Covered Loans
Financing Receivable, Past Due [Line Items]
Loans, before unearned loan fees	20,106	16,835
30-89 Days Past Due | Non-Covered Loans | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Loans, including unearned loan fees	6,358	1,948
30-89 Days Past Due | Non-Covered Loans | Commercial - investor owned
Financing Receivable, Past Due [Line Items]
Loans, including unearned loan fees	5,080	1,377
30-89 Days Past Due | Non-Covered Loans | Commercial - owner occupied
Financing Receivable, Past Due [Line Items]
Loans, including unearned loan fees	5,561	10,542
30-89 Days Past Due | Non-Covered Loans | Construction and land development
Financing Receivable, Past Due [Line Items]
Loans, including unearned loan fees	1,005	101
30-89 Days Past Due | Non-Covered Loans | Residential
Financing Receivable, Past Due [Line Items]
Loans, including unearned loan fees	2,085	2,833
30-89 Days Past Due | Non-Covered Loans | Other
Financing Receivable, Past Due [Line Items]
Loans, including unearned loan fees	17	34
90 or More Days Past Due | Non-Covered Loans
Financing Receivable, Past Due [Line Items]
Loans, before unearned loan fees	139,420	51,039
90 or More Days Past Due | Non-Covered Loans | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Loans, including unearned loan fees	23,975	12,228
90 or More Days Past Due | Non-Covered Loans | Commercial - investor owned
Financing Receivable, Past Due [Line Items]
Loans, including unearned loan fees	77,203	14,333
90 or More Days Past Due | Non-Covered Loans | Commercial - owner occupied
Financing Receivable, Past Due [Line Items]
Loans, including unearned loan fees	28,104	18,591
90 or More Days Past Due | Non-Covered Loans | Construction and land development
Financing Receivable, Past Due [Line Items]
Loans, including unearned loan fees	1,454	5,620
90 or More Days Past Due | Non-Covered Loans | Residential
Financing Receivable, Past Due [Line Items]
Loans, including unearned loan fees	8,651	258
90 or More Days Past Due | Non-Covered Loans | Other
Financing Receivable, Past Due [Line Items]
Loans, including unearned loan fees	33	9
Current | Non-Covered Loans
Financing Receivable, Past Due [Line Items]
Loans, before unearned loan fees	11,424,770	11,152,944
Current | Non-Covered Loans | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Loans, including unearned loan fees	4,918,428	4,706,252
Current | Non-Covered Loans | Commercial - investor owned
Financing Receivable, Past Due [Line Items]
Loans, including unearned loan fees	2,741,917	2,592,045
Current | Non-Covered Loans | Commercial - owner occupied
Financing Receivable, Past Due [Line Items]
Loans, including unearned loan fees	2,314,446	2,330,823
Current | Non-Covered Loans | Construction and land development
Financing Receivable, Past Due [Line Items]
Loans, including unearned loan fees	857,368	886,842
Current | Non-Covered Loans | Residential
Financing Receivable, Past Due [Line Items]
Loans, including unearned loan fees	353,780	355,832
Current | Non-Covered Loans | Other
Financing Receivable, Past Due [Line Items]
Loans, including unearned loan fees	$ 238,831	$ 281,150