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Investments (Narrative) (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Schedule of Investments [Line Items] |  |  |
Federal Home Loan Bank Stock and Federal Reserve Bank Stock | $ 23,600,000 |  | $ 23,500,000
Certificates of deposit, at carrying value | 0 |  |
Non-governmental issues exceeding 10% shareholders equity threshold | 0 |  | 0
Allowance for credit loss | 0 |  | 0
Credit-related investment impairment losses | 0 | $ 0 |
Asset Pledged as Collateral |  |  |
Schedule of Investments [Line Items] |  |  |
Carrying value of securities pledged | 700,000,000 |  | 709,000,000
Marketable equity securities |  |  |
Schedule of Investments [Line Items] |  |  |
Investment securities | $ 7,600,000 |  | $ 7,500,000

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