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Contractual Obligations and Off-Balance Sheet Items - Summary of Future Cash Payments Associated with Contractual Obligations Pursuant to Subordinated Debentures, Federal Reserve's Bank Term Funding Program and Federal Home Loan Bank Advances (Details) - Guarantee Obligations [Member]
$ in Thousands
Sep. 30, 2025
USD ($)
Contractual Obligations And Off Balance Sheet Items [Line Items]  
1 year or less $ 2,386,634
More than 1 year but less than 3 years 989,165
3 years or more but less than 5 years 179,908
5 years or more 1,060,625
Total 4,616,332
Payment Guarantee [Member] | FHLB advances [Member]  
Contractual Obligations And Off Balance Sheet Items [Line Items]  
1 year or less 2,400,000
Total $ 2,400,000