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Contractual Obligations and Off-Balance Sheet Items - Summary of Commitments Associated with Outstanding Standby Letters of Credit and Commitments to Extend Credit (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
Standby Letters of Credit [Member]  
Contractual Obligations And Off Balance Sheet Items [Line Items]  
1 year or less 61,923
More than 1 year but less than 3 years 15,787
3 years or more but less than 5 years 1,371
5 years or more 26
Total 79,107
Unused capacity on Warehouse Purchase Program loans [Member]  
Contractual Obligations And Off Balance Sheet Items [Line Items]  
1 year or less 800,823
Total 800,823
Commitments to Extend Credit [Member]  
Contractual Obligations And Off Balance Sheet Items [Line Items]  
1 year or less 1,523,888
More than 1 year but less than 3 years 973,378
3 years or more but less than 5 years 178,537
5 years or more 1,060,599
Total $ 3,736,402