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Commitments, Contingencies, and Financial Guarantees - Loan Commitments and Standby Letters of Credit (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Commitments and Contingencies Disclosure [Abstract]    
Unfunded loan commitments $ 11,741,820 $ 8,533,433
Standby letters of credit 266,892 194,323
Cancellable loan commitments 2,900,000 2,500,000
Carrying value of letters of credit $ 1,600 $ 1,700