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BORROWINGS AND LONG-TERM DEBT - Narrative (Details) - USD ($)	Sep. 30, 2025	Dec. 31, 2024	Sep. 30, 2024
Debt Instrument [Line Items]
Advances from Federal Home Loan Bank	$ 0	$ 0
Federal Home Loan Bank stock, at cost	17,294,000	17,250,000
Federal reserve bank, discount window funds	0	0
Carrying value	190,123,000	0	$ 0
Subordinated Debt | 3.5% Subordinated Notes Due 2032
Debt Instrument [Line Items]
Carrying value	78,449,000
Senior Notes | Senior Notes 6.50% Due 2026
Debt Instrument [Line Items]
Carrying value	64,608,000
Federal Reserve Bank Advances
Debt Instrument [Line Items]
Federal reserve bank, advances, general debt obligations, additional borrowing capacity	4,000,000,000.0
Federal Reserve Bank Advances | Asset Pledged as Collateral | Financing Receivable, Consumer Loans, Borrower-In-Custody Program
Debt Instrument [Line Items]
Federal reserve bank, advances, general debt obligations, disclosures, collateral pledged	1,400,000,000
Federal Reserve Bank Advances | Asset Pledged as Collateral | Investment Securities, Federal Reserve Discount Window Program
Debt Instrument [Line Items]
Federal reserve bank, advances, general debt obligations, disclosures, collateral pledged	3,000,000,000.0
Brokered And Wholesale Debt
Debt Instrument [Line Items]
Borrowings	0	0
Line of credit facility, remaining borrowing capacity	5,300,000,000
Federal Home Loan Bank of San Francisco
Debt Instrument [Line Items]
Federal Home Loan Bank stock, at cost	17,300,000	$ 17,300,000
Loans receivable pledged against FHLB	6,600,000,000
Additional borrowing capacity	$ 3,800,000,000

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