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Commitments and Contingencies - Schedule of Loan Commitments and Letters of Credit (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Loss Contingencies [Line Items]    
Carry amount included in other assets $ 596,259 $ 573,992
Permanent and short-term construction loans and letter of credit unfunded commitments 128,323 205,659
Funded portion of permanent and short-term loans and letters of credit 238,585 211,921
Future funding commitment amount 313,200 293,300
Letters of Credit    
Loss Contingencies [Line Items]    
Total letters of credit and unfunded lending commitments 236,031 200,269
Contractual amount net of risk participations 18,400 22,800
Commitments to fund commercial and industrial loans    
Loss Contingencies [Line Items]    
Total letters of credit and unfunded lending commitments 9,880,655 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 1,973,849 2,496,656
Commitments under home equity lines of credit    
Loss Contingencies [Line Items]    
Total letters of credit and unfunded lending commitments 2,115,145 2,135,120
Unused credit card lines    
Loss Contingencies [Line Items]    
Total letters of credit and unfunded lending commitments 452,273 453,303
Other loan commitments    
Loss Contingencies [Line Items]    
Total letters of credit and unfunded lending commitments 635,849 654,396
Total letters of credit and unfunded lending commitments    
Loss Contingencies [Line Items]    
Total letters of credit and unfunded lending commitments 15,293,802 16,253,624
Permanent and Short-Term Construction Loans and Letter of Credit Commitments    
Loss Contingencies [Line Items]    
Contractual amount net of risk participations 4,400 9,700
Funded Portion of Permanent and Short-Term Loans and Letters of Credit    
Loss Contingencies [Line Items]    
Contractual amount net of risk participations $ 18,200 $ 4,000