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Investment Securities (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2018 | Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024 | Jul. 31, 2024
Investment Securities |  |  |  |  |  |  |
Debt Securities, available-for-sale and held-to-maturity, allowance for credit loss |  | $ 0 |  | $ 0 |  |  |
Securities held to maturity, at amortized cost (fair value $5,243 and $4,591, respectively) |  | $ 7,000,000 |  | $ 7,000,000 |  | $ 7,000,000 | $ 2,000,000
Available-for-sale, securities in unrealized loss positions, depreciation from amortized cost percentage |  | 7.80% |  | 7.80% |  |  |
Held-to-maturity, securities in unrealized loss positions, depreciation from amortized cost percentage |  | 25.10% |  | 25.10% |  |  |
Proceeds from sales of securities available for sale |  | $ 0 | $ 0 | $ 11,192,000 | $ 19,189,000 |  |
Debt securities, available-for-sale, realized gain |  |  |  | 31,000 | 133,000 |  |
Debt securities, available-for-sale, realized loss |  |  |  | 86,000 | 101,000 |  |
Debt securities, available-for-sale, accrued interest, after allowance for credit loss |  | $ 2,200,000 |  | $ 2,200,000 |  | $ 2,100,000 |
Debt securities, held-to-maturity, accrued interest, after allowance for credit loss, statement of financial position [Extensible Enumeration] |  | Accrued interest receivable |  | Accrued interest receivable |  | Accrued interest receivable |
Debt securities, held-to-maturity, accrued interest, after allowance for credit loss |  | $ 18,000 |  | $ 18,000 |  | $ 18,000 |
Investment, number of shares acquired | 90,000 |  |  |  |  |  |
Investment ownership percentage | 5.00% |  |  |  |  |  |
Payments to acquire other investments | $ 1,900,000 |  |  |  |  |  |
Equity securities, FV-NI, unrealized gain (loss) |  | (41,000) | (6,000) | (23,000) | (74,000) |  |
Equity securities, FV-NI, current |  | 864,000 |  | 864,000 |  | 887,000 |
Investment company, financial support to investee contractually required, not provided, amount |  | 320,000 |  | 320,000 |  | 380,000 |
Limited Partnership Interest, Technology Fund |  |  |  |  |  |  |
Investment Securities |  |  |  |  |  |  |
Equity securities without readily determinable fair value, impairment loss, annual amount |  | 0 | $ 0 | 0 | $ 0 |  |
Limited Partnership Interest, Technology Fund | Other Assets |  |  |  |  |  |  |
Investment Securities |  |  |  |  |  |  |
Equity securities without readily determinable fair value, amount |  | $ 965,000 |  | $ 965,000 |  | $ 965,000 |

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