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Derivatives and Hedging Activities - Narrative (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025 | Dec. 31, 2022 | Dec. 31, 2025 | Dec. 01, 2025
Derivative [Line Items] |  |  |  |  |  |  |
Derivative instrument, asset amount secured by derivative | $ 1,420,000,000 |  | $ 1,420,000,000 |  |  | $ 1,500,000,000 | $ 1,520,000,000
Derivative, notional amount | 4,295,168,000 |  | 4,295,168,000 |  |  | 2,392,483,000 |
Collateral already posted, fair value | 0 |  | 0 |  |  | 0 |
Collateral received from third parties | 63,400,000 |  | 63,400,000 |  |  | 42,900,000 |
Credit risk derivative liability, fair value, excluding hedge | 75,500,000 |  | 75,500,000 |  |  | 54,000,000.0 |
Interest Rate Swap |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Gain (losses) in fair value adjustments | 7,000 | $ (9,000) | 17,000 | $ (25,000) |  |  |
Derivative term |  |  |  |  | 3 years |  |
Credit default swap |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative, notional amount | 71,200,000 |  | 71,200,000 |  |  | $ 75,800,000 |
Loss on derivative | 721,000 |  | 609,000 |  |  |  |
Premium expense | $ 877,000 |  | $ 1,800,000 |  |  |  |
Interest Rate Option | Minimum |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative term |  |  | 3 years |  |  |  |
Interest Rate Option | Maximum |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative term |  |  | 5 years |  |  |  |

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- Definition The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 185 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480401/815-10-55-185 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4H -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4H + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5A -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-5A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 18 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481112/505-10-50-18 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 20 -Name Accounting Standards Codification -Section 25 -Paragraph 6A -Publisher FASB -URI https://asc.fasb.org/1943274/2147480682/815-20-25-6A + Details
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- Definition The carrying value as of the balance sheet date of the assets received as collateral against securities loaned to other broker-dealers. Borrowers of securities generally are required to provide collateral to the lenders of securities, commonly cash but sometimes other securities or standby letters of credit, with a value slightly higher than that of the securities borrowed. In instances where the entity is permitted to sell or re-pledge these securities, the entity reports the fair value of the collateral received and the related obligation to return the collateral as a liability. + References No definition available. + Details
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