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Investment Securities - Pledged Securities and Concentration Narrative (Details) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2024 USD ($) | Jun. 30, 2024 USD ($) | Dec. 31, 2023 USD ($)
Concentration of risk |  |  |
Number of securities with intent to sell |  | 0 | 0
Credit losses recognized on securities | $ 0 | $ 0 | $ 0
Collateral Dependent Loans |  |  |
Financial Instruments Owned and Pledged as Collateral |  |  |
Investment securities pledged as collateral | 4,100,000,000 | 4,100,000,000 | 5,000,000,000.0
Collateral Dependent Loans | Public deposits |  |  |
Financial Instruments Owned and Pledged as Collateral |  |  |
Investment securities pledged as collateral | 1,800,000,000 | 1,800,000,000 | 2,600,000,000
Collateral Dependent Loans | Other financial transactions |  |  |
Financial Instruments Owned and Pledged as Collateral |  |  |
Investment securities pledged as collateral | 28,100,000 | 28,100,000 | 183,000,000.0
Borrowing Capacity |  |  |
Financial Instruments Owned and Pledged as Collateral |  |  |
Investment securities pledged as collateral | 2,200,000,000 | 2,200,000,000 | 2,300,000,000
Non-government issuer |  |  |
Concentration of risk |  |  |
Securities of issuers in excess of 10% of stockholders' equity | $ 0 | $ 0 | $ 0

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- Definition Amount, after allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), investment in debt security measured at amortized cost (held-to-maturity), and investment in debt security measured at fair value with change in fair value recognized in net income (trading). + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 80 -Name Accounting Standards Codification -Section 55 -Paragraph 14 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480078/944-80-55-14 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 80 -Name Accounting Standards Codification -Section 55 -Paragraph 9 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480078/944-80-55-9 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481830/320-10-45-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)(6)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
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