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Commitments and Contingencies - Schedule of Loan Commitments and Letters of Credit (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Loss Contingencies [Line Items]    
Carry amount included in other assets $ 806,987 $ 672,803
Permanent and short-term construction loans and letter of credit unfunded commitments 333,625 205,855
Funded portion of permanent and short-term loans and letters of credit 187,048 229,668
Future funding commitment amount 426,700 358,500
Letters of credit    
Loss Contingencies [Line Items]    
Total letters of credit and unfunded lending commitments 417,621 340,385
Contractual amount net of risk participations 15,700 16,800
Commitments to fund commercial and industrial loans    
Loss Contingencies [Line Items]    
Total letters of credit and unfunded lending commitments 10,000,222 9,956,797
Commitments to fund commercial real estate, construction, and land development loans    
Loss Contingencies [Line Items]    
Total letters of credit and unfunded lending commitments 2,193,892 2,135,638
Commitments under home equity lines of credit    
Loss Contingencies [Line Items]    
Total letters of credit and unfunded lending commitments 2,107,011 2,119,616
Unused credit card lines    
Loss Contingencies [Line Items]    
Total letters of credit and unfunded lending commitments 448,642 446,800
Other loan commitments    
Loss Contingencies [Line Items]    
Total letters of credit and unfunded lending commitments 554,841 621,659
Total letters of credit and unfunded lending commitments    
Loss Contingencies [Line Items]    
Total letters of credit and unfunded lending commitments 15,722,229 15,620,895
Permanent and Short-Term Construction Loans and Letter of Credit Commitments    
Loss Contingencies [Line Items]    
Contractual amount net of risk participations 14,800 16,000
Funded Portion of Permanent and Short-Term Loans and Letters of Credit    
Loss Contingencies [Line Items]    
Contractual amount net of risk participations $ 18,000 $ 16,200