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Loans - Recorded Investment in Nonperforming Loans by Category (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Loans, including unearned loan fees $ 11,583,109 $ 11,220,355
Non-Covered Loans    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Nonaccrual 78,831 42,667
Loans over 90 days past due and still accruing interest 49,047 20
Total nonperforming loans 127,878 42,687
Loans, including unearned loan fees 11,584,296 11,220,818
Nonaccrual loans with no allowance 30,993 16,123
Non-Covered Loans | Commercial Real Estate    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Loans, including unearned loan fees 80,433 21,657
Non-Covered Loans | Residential Real Estate    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Loans, including unearned loan fees 8,886 482
Non-Covered Loans | Blanket Lien    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Loans, including unearned loan fees 3,210 4,765
Non-Covered Loans | Other    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Loans, including unearned loan fees 15,644 3,495
Non-Covered Loans | Commercial and industrial    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Nonaccrual 29,307 15,810
Loans over 90 days past due and still accruing interest 405 11
Total nonperforming loans 29,712 15,821
Loans, including unearned loan fees 4,948,761 4,720,428
Nonaccrual loans with no allowance 15,159 4,279
Non-Covered Loans | Commercial and industrial | Commercial Real Estate    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Loans, including unearned loan fees 0 0
Non-Covered Loans | Commercial and industrial | Residential Real Estate    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Loans, including unearned loan fees 23 0
Non-Covered Loans | Commercial and industrial | Blanket Lien    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Loans, including unearned loan fees 3,210 4,279
Non-Covered Loans | Commercial and industrial | Other    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Loans, including unearned loan fees 15,644 3,495
Non-Covered Loans | Commercial - investor owned    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Nonaccrual 35,361 14,186
Loans over 90 days past due and still accruing interest 43,083 0
Total nonperforming loans 78,444 14,186
Loans, including unearned loan fees 2,824,200 2,607,755
Nonaccrual loans with no allowance 5,842 2,106
Non-Covered Loans | Commercial - investor owned | Commercial Real Estate    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Loans, including unearned loan fees 76,256 14,136
Non-Covered Loans | Commercial - investor owned | Residential Real Estate    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Loans, including unearned loan fees 0 0
Non-Covered Loans | Commercial - investor owned | Blanket Lien    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Loans, including unearned loan fees 0 0
Non-Covered Loans | Commercial - investor owned | Other    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Loans, including unearned loan fees 0 0
Non-Covered Loans | Commercial - owner occupied    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Nonaccrual 10,654 10,910
Loans over 90 days past due and still accruing interest 0 0
Total nonperforming loans 10,654 10,910
Loans, including unearned loan fees 2,348,111 2,359,956
Nonaccrual loans with no allowance 6,879 8,235
Non-Covered Loans | Commercial - owner occupied | Commercial Real Estate    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Loans, including unearned loan fees 4,177 7,521
Non-Covered Loans | Commercial - owner occupied | Residential Real Estate    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Loans, including unearned loan fees 456 482
Non-Covered Loans | Commercial - owner occupied | Blanket Lien    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Loans, including unearned loan fees 0 486
Non-Covered Loans | Commercial - owner occupied | Other    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Loans, including unearned loan fees 0 0
Non-Covered Loans | Construction and land development    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Nonaccrual 386 1,503
Loans over 90 days past due and still accruing interest 0 0
Total nonperforming loans 386 1,503
Loans, including unearned loan fees 859,827 892,563
Nonaccrual loans with no allowance 231 1,503
Non-Covered Loans | Residential    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Nonaccrual 3,123 258
Loans over 90 days past due and still accruing interest 5,525 0
Total nonperforming loans 8,648 258
Loans, including unearned loan fees 364,516 358,923
Nonaccrual loans with no allowance 2,882 0
Non-Covered Loans | Residential | Commercial Real Estate    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Loans, including unearned loan fees 0  
Non-Covered Loans | Residential | Residential Real Estate    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Loans, including unearned loan fees 8,407  
Non-Covered Loans | Residential | Blanket Lien    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Loans, including unearned loan fees 0  
Non-Covered Loans | Residential | Other    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Loans, including unearned loan fees 0  
Non-Covered Loans | Other    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Nonaccrual 0 0
Loans over 90 days past due and still accruing interest 34 9
Total nonperforming loans 34 9
Loans, including unearned loan fees 238,881 281,193
Nonaccrual loans with no allowance $ 0 $ 0