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Borrowings and Subordinated Debentures - Narrative (Details) - USD ($) | 6 Months Ended |
--- | --- | ---
Jun. 30, 2024 | Dec. 31, 2023
Federal Reserve Bank Advances |  |
Debt Instrument [Line Items] |  |
Balance | $ 0 | $ 0
Secured Debt [Member] | Federal Reserve Bank Advances |  |
Debt Instrument [Line Items] |  |
Borrowing capacity description | 6,600,000,000 |
Collateralized financings | 7,100,000,000 |
Securities loaned, fair value of collateral | 1,100,000,000 |
Secured Debt [Member] | Bank Term Funding Program | Federal Reserve Bank Advances |  |
Debt Instrument [Line Items] |  |
Borrowing capacity description | 545,000,000.0 |
Securities loaned, fair value of collateral | 584,400,000 |
Unused Lines of Credit |  |
Debt Instrument [Line Items] |  |
Balance | 0 | 0
Current borrowing capacity | 290,000,000.0 |
Unused commitment fees | 0 |
AFX short-term borrowings |  |
Debt Instrument [Line Items] |  |
Balance | $ 0 | $ 0
Credit-Link Notes |  |
Debt Instrument [Line Items] |  |
Variable interest, percentage rate | 16.05% | 16.02%
Weighted average interest rate | 10.71% |
Secured debt | $ 2,410,000,000 |
Other borrowings | $ 124,434,000 | $ 123,116,000
Credit-Link Notes | Highest Rate of Spread |  |
Debt Instrument [Line Items] |  |
Variable interest, percentage rate | 13.25% |
Credit-Link Notes | Lowest Rate of Spread |  |
Debt Instrument [Line Items] |  |
Variable interest, percentage rate | 8.00% |
Federal Home Loan Bank of San Francisco |  |
Debt Instrument [Line Items] |  |
Collateralized financings | $ 10,600,000,000 |
Securities loaned, fair value of collateral | 20,200,000 |
Letters of credit outstanding, amount | 372,900,000 | 243,800,000
Federal Home Loan Bank of San Francisco | Secured Debt [Member] |  |
Debt Instrument [Line Items] |  |
Borrowing capacity description | 6,700,000,000 |
Line of credit, current | 600,000,000 | 0
Federal Home Loan Bank of San Francisco | Secured Debt [Member] | Bank Term Funding Program |  |
Debt Instrument [Line Items] |  |
Line of credit, current | $ 545,000,000 | $ 2,618,300,000

X
- Definition The value of the collateral (typically cash) that the entity receives in a financing transaction in exchange for securities lent. This item represents a liability in the financial statements of the lender of the securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 25 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481557/860-30-25-8 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
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- Definition The carrying value as of the balance sheet date of the current portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(13)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
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