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Commitments and Contingencies - Schedule of Partnerships, Programs, and Other Investments and Funding of Small Business Loans (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Loss Contingencies [Line Items]    
Carrying amount included in other assets $ 672,803 $ 573,992
Permanent and short-term construction loans and letter of credit commitments 205,855 205,659
Funded portion of permanent and short-term loans and letters of credit 229,668 211,921
Future funding commitment amounts 358,500 293,300
Letters of Credit    
Loss Contingencies [Line Items]    
Total letters of credit and unfunded lending commitments 340,385 200,269
Contractual amount net of risk participations 16,800 22,800
Commitments to fund commercial and industrial loans    
Loss Contingencies [Line Items]    
Total letters of credit and unfunded lending commitments 9,956,797 10,313,880
Commitments to fund commercial real estate, construction, and land development loans    
Loss Contingencies [Line Items]    
Total letters of credit and unfunded lending commitments 2,135,638 2,496,656
Commitments under home equity lines of credit    
Loss Contingencies [Line Items]    
Total letters of credit and unfunded lending commitments 2,119,616 2,135,120
Unused credit card lines    
Loss Contingencies [Line Items]    
Total letters of credit and unfunded lending commitments 446,800 453,303
Other loan commitments    
Loss Contingencies [Line Items]    
Total letters of credit and unfunded lending commitments 621,659 654,396
Total letters of credit and unfunded lending commitments    
Loss Contingencies [Line Items]    
Total letters of credit and unfunded lending commitments 15,620,895 16,253,624
Permanent and Short-Term Construction Loans and Letter of Credit Commitments    
Loss Contingencies [Line Items]    
Contractual amount net of risk participations 16,000 9,700
Funded Portion of Permanent and Short-Term Loans and Letters of Credit    
Loss Contingencies [Line Items]    
Contractual amount net of risk participations $ 16,200 $ 4,000