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Loans and Allowance for Credit Losses amortized cost basis of residential PCD loans and the related amount of non-credit discount (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Jun. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]            
Allowance for credit losses $ (219,884) $ (222,730) $ (223,153) $ (228,249) $ (225,698) $ (202,689)
Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss 23,482,610   24,074,827      
Financial Asset Acquired with Credit Deterioration [Member]            
Financing Receivable, Credit Quality Indicator [Line Items]            
Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss $ 34,000   $ 38,000