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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
Jun. 30, 2025
USD ($)
Contractual Obligations And Off Balance Sheet Items [Line Items]  
1 year or less $ 2,418,238
More than 1 year but less than 3 years 962,390
3 years or more but less than 5 years 98,198
5 years or more 1,141,011
Total 4,619,837
Payment Guarantee [Member] | FHLB advances [Member]  
Contractual Obligations And Off Balance Sheet Items [Line Items]  
1 year or less 2,900,000
Total $ 2,900,000